7. For which problem will you need to regroup I ten as 10 ones? Fill in the bubble next to the correct answer. \( 087-43 \) \( 089-9 \) \( 82-64 \)

When subtracting \( 82-64 \), regrouping is necessary because you need to take away more from the tens place (8) than you have. You’ll need to borrow 1 ten (which is 10 ones) from the 8 in the tens place, turning it into 7 tens and giving you a total of 12 ones to perform the subtraction. For the problem \( 087-43 \), you’ll also need to regroup. You'll take 1 ten from the 8 in the tens place, leaving you with 7 tens, and turning the 7 ones into 17 ones to subtract 3 from. This is a classic example of regrouping in subtraction, ensuring you can handle those pesky digits that try to throw off your calculations!