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Place Value

Rounding

Addition

Subtraction

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Rounding with a Vertical Number Line - Engage NY Math - Common Core

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Rounding Multi-Digit Numbers: Target Method

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Addition with regrouping (standard algorithm)

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Addition with regrouping (standard algorithm)

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Stack the numbers!

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Stack them! "If there's more on the floor, go next door and get 10 more"

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Multiplication: In Unit 2 we start with what was learned in 3rd grade; single digit multiplication with visual representations. We extend the visual representations with a variety of styles and apply multiplication strategies to multi-digit numbers (arrays, base-10 blocks, tape diagrams). We move into multiplication strategies with only numbers after students understand how/ why multiplication works.

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We can use base-10 blocks to model 13x15

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Remember, base-10 blocks can act as a "tiled array" to cover the area. We learned in class that instead of using 1 cubes, it's more efficient to use a 100 block to represent 10x10 first. We also noticed the 10x10 block represented the digits in the tens place.

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Multiplication - 2 digit x 2 digit (Base 10 block arrays)

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Multiplication - 2 digit x 2 digit (Base 10 block arrays)

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📣 Math tip: Use base ten blocks to multiply 2 digit by 2 digit numbers

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Tape Diagram - Multiplication Comparisons

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Tape Diagram - Multiplication Comparisons

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Today we learned box method for multiplication. Here is a video that demonstrates the process.

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Box Method Multiplication | 2-Digits x 2-Digits | Math with Mr. J

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Unit 3 is a review of division skills learned in 3rd grade. From there, we add onto the knowledge and move into Partial Quotient division.

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Math Antics - Division With Partial Quotients

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Unit 4 introduces students to decimal place value - tenths and hundredths.

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Unit 5 starts with a review of fraction skills learned in 3rd grade. Students will review the basics (what is a numerator and denominator), then build onto their knowledge. You will see equivalent fractions, decomposing fractions, etc.

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Composite fraction

Unit fraction

"Decompose" means to break a fraction down into smaller parts. Example: 5/8 = 1/8 + 2/8 + 2/8

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Line Plots with Fractions (1/8's, 1/4's, 1/2's) | Line Plot Word Problems with Fractions