Tell how to find 81 - 16 using mental math
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dunno (80+1)-(15+1) = 80-15 = 65
To find the difference between 81 and 16 using mental math, you can use the concept of regrouping or borrowing from the tens place.
1. Start by subtracting the ones place: 1 from 11 is 10.
- Write down the 0 in the ones place.
2. Move to the tens place: 7 from 8 is 1.
- Write down the 1 in the tens place.
3. So the difference between 81 and 16 is 65.
Here's a breakdown of the steps:
81
- 16
------
65
With practice, you can perform mental math calculations like these more quickly.