| 1 a. |
8900 – 7100 = _________
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| 1 b. |
10000 – 1200 = _________
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| 2 a. |
7300 – 4800 = _________
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| 2 b. |
4100 – 2600 = _________
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| 3 a. |
9100 – 7700 = _________
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| 3 b. |
9900 – 3900 = _________
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| 4 a. |
5000 – 2300 = _________
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| 4 b. |
6700 – 4900 = _________
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| 5 a. |
8900 – 7300 = _________
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| 5 b. |
5800 – 1000 = _________
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| 6 a. |
9200 – 4700 = _________
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| 6 b. |
9500 – 2500 = _________
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| 7 a. |
9400 – 5800 = _________
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| 7 b. |
5300 – 800 = _________
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| 8 a. |
9500 – 1900 = _________
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| 8 b. |
6200 – 5000 = _________
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| 9 a. |
5900 – 3700 = _________
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| 9 b. |
5800 – 2000 = _________
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|