This activity is about subtraction with decimals and exchanging if necessary.
Example
Work out the subtraction.
891.32 - 857.4 = |
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Answer
Step 1. Line up the decimal points, inserting zeros if needed for 857.40
Step 2. Subtract, starting with the hundredths place, 2 - 0 = 2
Step 3. Move to the tenths place. We need to exchange, so 1 in the ones place becomes 0 and 3 in the tenths place becomes 13. Subtract 13 - 4 = 9
Step 4. Move to the ones place, to the left of the decimal point. We need to exchange, so 9 in the tens place becomes 8 and 0 in the ones place becomes 10. Subtract 10 - 7 = 3
Step 5. Subtract in the tens place 8 - 5 = 3 and then subtract in the hundreds place, 8 - 8 = 0
Answer: 33.92
The answer is 33.92
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