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Find the following values without a calculator.
  1. 7 + 9 = _______
  2. 5 + 11 = _______
  3. 3 + 10 = _______
  4. 17 + 5 = _______
1 m
Find the value of 1 unit.
  1. 1 u + 5 = 10
  2. 5 + 1 u = 10
  3. 10 = 1 u - 5
  4. 10 = 5 + 1 u
2 m
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Find the following values without a calculator.
  1. 14 + 18 = _______
  2. 26 + 9 = _______
  3. 74 + 10 = _______
  4. 30 + 70 = _______
1 m
Find the value of 1 unit.
  1. 1 u - 5 = 10
  2. 10 = 1 u - 5
  3. 10 - 1 = 1 u - 5
  4. 10 + 1 = 1 u - 5
2 m
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Find the following values without a calculator.
  1. 75 + 75 = _______
  2. 80 + 3 = _______
  3. 93 + 1 = _______
  4. 56 + 9 = _______
1 m
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Find the following values without a calculator.
  1. 30 + 60 = _______
  2. 63 + 63 = _______
  3. 55 + 44 = _______
  4. 32 + 32 + 32 = _______
1 m
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Find the following values without a calculator.
  1. 42 + 4 = _____
  2. 35 + 7 = _____
  3. 48 + 3 = _____
  4. 59 + 18 = _____
1 m
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Find the following values without a calculator.
  1. 98 + 9 = _______
  2. 998 + 6 = _______
  3. 995 + 70 = _______
  4. 9997 + 73 = _______
1 m
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Find the following values without a calculator.
  1. 9997 + 6 = _______
  2. 9996 + 38 = _______
  3. 9995 + 593 = _______
  4. 10000 + 816 = _______
1 m
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Find the following values without a calculator.
  1. 6 - 5 = _______
  2. 16 - 10 = _______
  3. 19 - 2 = _______
  4. 11 - 7 = _______
1 m