Question

When ten is added to a number the digit in the tens place of the number increases by 1

Answer 1

Answer:

We know that 9 = 10âˆ'1. So adding 9 is like adding 10 and then subtracting 1. Adding 10 increases the the digit in the tens place by 1 (as long as it is not 9). Subtracting 1 decreases the the digit in the ones place by 1 (as long as it is not 0).