Estimating Whole Number Sums | Addition Estimation | Math with Mr. J
From Math with Mr. J
8 min2nd3rd4thMath
Summary
How to add and subtract multi-digit whole numbers, including regrouping (carrying and borrowing). Mr. J lines up the places and works the standard algorithm.
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All ages
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Teaching resources
Discussion questions
Line up the digits by place value, then add or subtract each place, regrouping when needed.
- When do you need to regroup (carry or borrow)?
- Why do you line the numbers up by place value?
- How can you check a subtraction answer with addition?
Quick work-a-long
Words to know: add, subtract, regroup, place value
- Solve 458 + 276.
- Solve 503 - 168.