- Understand the concept of regrouping in subtraction, which involves borrowing from a higher place value when the digit in the minuend is smaller than the corresponding digit in the subtrahend.
- Use base ten blocks to visually represent numbers: a large cube for hundreds, a rod for tens, and a small cube for ones.
- For a subtraction problem like 243 - 157, represent 243 with 2 hundreds, 4 tens, and 3 ones.
- Since you cannot subtract 7 ones from 3 ones, regroup one ten into 10 ones, making it 3 tens and 13 ones.
- Subtract 7 ones from 13 ones to get 6 ones.
- Now subtract 5 tens from 3 tens; since this is not possible, regroup one hundred into 10 tens, making it 1 hundred and 13 tens.
- Subtract 5 tens from 13 tens to get 8 tens.
- Finally, subtract 1 hundred from 1 hundred to get 0 hundreds.
- The result is 86.
Parent Tip: Review the logic above to help your child master the concept of subtraction with regrouping using base ten blocks worksheet.
