Question

5. 656 127

9. 153 - 37
6. 781-536
10. 777 135
Find each difference using mental math

Answer 1

To calculate the differences using mental math, subtract the smaller number from the larger number in parts, focusing on the hundreds, tens, and ones separately. The differences are: 656 - 127 = 529, 153 - 37 = 116, 781 - 536 = 245, and 777 - 135 = 642.

Step-by-step explanation:

To find each difference using mental math, you need to subtract the smaller number from the larger number. Here is how you can calculate each one:

1. 656 minus 127: Focus on subtracting the hundreds, then tens, then ones separately. So, 656 - 100 = 556, 556 - 20 = 536, 536 - 7 = 529. The answer is 529.
2. 153 minus 37: A quick way to subtract is by rounding 37 to 40. So, 153 - 40 = 113, but since we subtracted an extra 3, we add it back to get 116. The answer is 116.
3. 781 minus 536: Subtracting 500 from 781 gives 281, then subtract 30 to get 251, and finally, subtract 6 to get 245. The difference is 245.
4. 777 minus 135: Similar approach: 777 - 100 = 677, 677 - 30 = 647, 647 - 5 = 642. The answer is 642.