Sumar.
| 1 a. |
20 + 60 + ______ + 80 = 190
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| 1 b. |
50 + 60 + _________ + 50 = 220
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| 2 a. |
60 + 80 + 80 + ______ = 310
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| 2 b. |
80 + _________ + 90 + 90 = 290
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| 3 a. |
______ + 40 + 70 + 80 = 220
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| 3 b. |
______ + 60 + 90 + 40 = 270
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| 4 a. |
70 + _________ + 30 + 90 = 280
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| 4 b. |
_________ + 90 + 90 + 80 = 270
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| 5 a. |
50 + 20 + 40 + ______ = 140
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| 5 b. |
40 + ______ + 40 + 30 = 200
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| 6 a. |
_________ + 60 + 80 + 70 = 240
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| 6 b. |
60 + ______ + 80 + 70 = 270
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| 7 a. |
80 + 50 + 50 + ______ = 200
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| 7 b. |
60 + 20 + 80 + ______ = 180
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| 8 a. |
_________ + 80 + 80 + 50 = 300
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| 8 b. |
90 + 80 + 70 + ______ = 260
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