# Explanation Videos For Grade 2

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## Grade 2 Semester 1 member’s video

### Semester 1 Week 1 – Numbers to 1,000

In working with numbers up to 1000, students build upon their foundational counting and number pattern skills, and apply these skills to work with larger numbers. Students will learn to use skip counting, estimation, place value understanding, and number comparisons to solve multi digit addition and subtraction problems. Students will interpret and utilize base ten representations and facts, to weave conceptual understanding with effective problem solving.

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### Semester 1 Week 3 – Addition to 1,000

Addition to 1000 moves students from concrete to abstract ability in adding multi digit numbers. Place value understanding and base ten interpretation are securely established in order to regroup numbers. Students can start by building numbers by place value with hands-on manipulatives, before moving on to pictorial representations of these numbers. Students should work with concrete and pictorial tools to develop a solid and conceptual understanding of regrouping. Finally, teach students to use conceptual understanding of each digit’s place value with the standard algorithm. Students develop mastery of regrouping within each place value in order to regroup larger numbers accurately and efficiently.

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### Semester 1 Week 5 – Subtraction to 1,000

In this lesson, students subtract three digit numbers with and without regrouping, utilizing understanding of place value. Students can start by building numbers by place value with hands-on manipulatives, before moving on to pictorial representations of these numbers. Students should work with concrete and pictorial tools to develop a solid and conceptual understanding of regrouping. Finally, teach students to use this conceptual understanding of each digit’s place value and regrouping with the standard algorithm.

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### Semester 1 Week 8 – Using Bar Models: Addition and Subtraction

Teach students how to use bar models as effective representations of unknown values and can be used in both addition and subtraction problems. In these lessons, the focus is on part-part-whole representation and comparison representation for bar models. In particular, students will need to identify missing parts or the whole from the word problem and represent them visually in a bar model. Bar models can also be used in solving complex number contexts found in two or more step word problems.

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### Semester 1 Week 10 – Multiplication and Division

Teach students to use addition within arrays to set up multiplication expressions. Additionally, teach them to practice division through the idea of equal sharing and equal groups. Introduce common language between the operations helps students to understand the relationship between multiplication and division. Finally, teach students that two addends will always result in an even sum. This mirrors the understanding that all even numbers can be split equally in half, which reinforces doubles facts and prepares students for fractions.

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### Semester 1 Week 12 – Multiplication Tables of 2, 5 and 10

Students can begin to work on learning multiplication tables through the numbers 2, 5, and 10. They should have been exposed to 2s and 10s through skip counting, place value, and number patterns. These multiplication tables set the stage for finding the product of multiplication expressions, and their related division equations. Students can also be introduced to the associative and distributive properties of multiplication, which they will use with larger numbers in future lessons. Using these properties helps students work with large or multiple numbers into parts that are more accessible.

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### Semester 1 Week 15 – Length

Teach students to measure length with relevant tools accurately, using logic and sense of objects measured, as well as understanding that measurement tools use standardized intervals. Students will also learn to measure objects with different units and to estimate lengths based on existing knowledge of standards lengths. Students will also compare different lengths relative to each other or to an outside reference point.

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### Semester 1 Week 17 – Mass and Volume(Optional)

This lesson focuses on reading scales of weighed objects or pictorial representations of weighed objects on scales. They will compare masses in standardized units and use logic to answer questions about weighed masses and volumes, and use bar models to solve real life type word problems.

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## Grade 2 Semester 2 member’s video

### Semester 2 Week 1 – Mental Math Estimation

Teach students how to practice mentally adding or subtracting numbers with and without regrouping. Strategies include adding or subtracting by place value, decomposing numbers to tens or hundreds, and adding or subtracting by multiples of ten or a hundred. Students can also using rounding to estimate sums or differences and check if their answers are reasonable.

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### Semester 2 Week 3 – Money

In this lesson, students will identify coins and their values and add sums of different coin combinations. They will write monetary amounts in dollars and cents, using relevant symbols, and compare different values. Comparing monetary values incorporates accurate coin identification and determining differences, as well as understanding place value. Finally, students will solve money-based word problems.

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### Semester 2 Week 5 – Fractions

Students will work with equal parts of a whole and name fractional parts using appropriate math language. The size and shape of the whole will vary. They will compare fractions that share the same unit as well as fractions of different sizes, and add and subtract unit fractions within a whole. Students should demonstrate understanding that fractions are parts of a whole and can be identified and compared within that whole.

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### Semester 2 Week 6 – Fractions

Teach students how to demonstrate understanding of equal parts of a whole by partitioning wholes into fractional parts and naming them appropriately. Use pictorial representations to reinforce knowledge. Students will compare different sized fractions in reference to the same whole to determine the difference.

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### Semester 2 Week 7 – Fractions

Teach students about the unit fraction when adding and subtracting fractions. It is important that students do not add or subtract the numerator or denominator, but understand that the unit fraction represents one part of the whole. When adding and subtracting like fractions that share the same unit fraction, that unit fraction is repeatedly added or repeatedly subtracted (two-fourths is essentially one-fourth plus another one-fourth). Students must use fraction-specific language such as one-fourth, and not one over four, for conceptual understanding.

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### Semester 2 Week 8 – Time

Students will learn how to tell time on both analog and digital clocks, determining the passage of hours or minutes to the five minute interval. Students will also identify the time of day based on real life contexts and understand intervals of time before or after a set time.

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### Semester 2 Week 9 – Multiplication Tables of 3 and 4

In this lesson, students use their knowledge of equal groups in terms of 3s and 4s to find the product of each expression. Learning the 3s and 4s times tables allows students to learn the related division facts. Students can practice using the distributive property of multiplication to interpret smaller products within the larger target expression. Additionally, students can be introduced to other multiplication properties, commutative, associative, which may also be known as turn around facts and extended facts, respectively.

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### Semester 2 Week 14 – Picture Graphs

Teach students to work with information provided in picture graphs and bar graphs, They will learn how to read and interpret represent information in these graphs, as well as to create their own. Finally, students will demonstrate understanding of the information represented in these graphs by answering questions based on the graphs.

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### Semester 2 Week 16 – Geometry – Lines and Surfaces, Shapes and Patterns

In this lesson, students demonstrate understanding of different two and three dimensional shapes and their attributes. They will be able to identify two dimensional polygons, as well as smaller shapes within larger ones and use fractional terms to explain the relationship. Students will be able to classify three dimensional shapes by their attributes, visually and through touch.

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