Question

Circle the correct subtraction fact (by using casting out nine).

2362 – 632 = 1720

Answer 1

2362 – 632 = 1720

2362 – 632 = 1720

2 – 5 = 10

2 = 10 + 5

2 = 1 + 5

2 = 5

2 = 2

Answer 2

Step 1: Calculate the digit sums (casting out nines)

Add the digits:

For 2362: 2 + 3 + 6 + 2 = 13 and 1 + 3 = 4 (digit sum)

For 632: 6 + 3 + 2 = 11 and 1 + 1 = 2 (digit sum)

For 1720: 1 + 7 + 2 + 0 = 10 and 1 + 0 = 1 (digit sum)

Step 2: Subtract the digit sums

4 − 2 = 2

Step 3: Compare with the digit sum of 1720

The digit sum of 1720 is 1, which does not match the expected digit sum (2).

he subtraction fact 2362 − 632 = 1720 is incorrect based on casting out nines.