Question

# One number makes both the equations true. Find the missing number.

14 + ⎕ = 26

⎕ + 26 = 38

- 11
- 12
- 13
- 14

## The correct answer is: 12

### To solve it, add ones and tens.

If the missing number is 12, then it makes both the equations true.

So, 14 + 12 = 26 and 12 + 26 = 38

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Here the concept of Break Apart Numbers is used where a number is divided in two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first correct step for finding the sum of 28 + 36 mentally is 64.

### Find the sum of 28 and 36 using mental math.

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Here the concept of Break Apart Numbers is used where a number is divided in two parts to make addition easy. The concept of friendly numbers is also used so that it becomes easy for addition or subtraction purpose. So, the first correct step for finding the sum of 18 + 32 mentally is 50.