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Subtraction Frame Inspector

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About this activity

YES/NO activity on subtraction frames.

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Lebanon

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Subtraction Frame Inspector
 

Subtraction Frame InspectorOnline version

YES/NO activity on subtraction frames.

by Hidden Author
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1. A subtraction frame subtracts the same number repeatedly.

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10. 822 − 648 requires decomposition.

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5. The complete frame can be: 20 → 16 → 12 → 8 → 4 → 0

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11. 822 − 648 = 174.

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9. 1 358 − 245 = 1 113.

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7. You continue a subtraction frame until you reach zero or cannot subtract the same number again.

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8. The subtraction 1 358 − 245 requires decomposition.

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12. Decomposition may be needed when a top digit is smaller than the digit below it.

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3. Continue the frame: 20 → 16 → 12 → 8 The next number is 4.

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4. Continue the same frame: 20 → 16 → 12 → 8 → 4 The next number is 2.

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6. In a subtraction frame, you should change the number being subtracted at every step.

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2. Starting at 20 and subtracting 4 gives 16.

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