Grade 4 students learn to solve additive compare word problems using tape diagrams in this Eureka Math lesson, focusing on "how much more" and "how many fewer" comparisons with multi-digit numbers. Students practice identifying whether the unknown is a missing part and determining when subtraction is needed, even when the language of a problem suggests addition. The lesson also reinforces checking solutions for reasonableness using estimation and rounding.
Section 1
Adding and Subtracting Large Numbers
The standard algorithm for addition and subtraction requires aligning numbers vertically by place value. Calculations are performed column by column from right to left (ones, to tens, to hundreds, etc.), regrouping ("carrying" in addition or "borrowing" in subtraction) as necessary.
Section 2
Modeling Additive Comparisons with Tape Diagrams
To find the difference () between a larger quantity () and a smaller quantity () in an additive comparison problem, you subtract the smaller quantity from the larger quantity.
Section 3
Solving Two-Step Comparison Problems
To solve a multi-step comparison problem, first combine parts into a total using addition, then find the difference using subtraction. This can be represented as finding the difference where one quantity is a sum: .
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Section 1
Adding and Subtracting Large Numbers
The standard algorithm for addition and subtraction requires aligning numbers vertically by place value. Calculations are performed column by column from right to left (ones, to tens, to hundreds, etc.), regrouping ("carrying" in addition or "borrowing" in subtraction) as necessary.
Section 2
Modeling Additive Comparisons with Tape Diagrams
To find the difference () between a larger quantity () and a smaller quantity () in an additive comparison problem, you subtract the smaller quantity from the larger quantity.
Section 3
Solving Two-Step Comparison Problems
To solve a multi-step comparison problem, first combine parts into a total using addition, then find the difference using subtraction. This can be represented as finding the difference where one quantity is a sum: .
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter