medium Set 81 Form Exercise

Write the fact family for 2, 1, 3:

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Answer: 2 + 1 = 3; 1 + 2 = 3; 3 - 2 = 1; 3 - 1 = 2

SubType
fact-family
Facts
  • 2 + 1 = 3
  • 1 + 2 = 3
  • 3 - 2 = 1
  • 3 - 1 = 2
Difficulty
medium

Write the fact family for 2, 10, 20:

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Answer: 2 × 10 = 20; 10 × 2 = 20; 20 ÷ 2 = 10; 20 ÷ 10 = 2

SubType
fact-family
Facts
  • 2 × 10 = 20
  • 10 × 2 = 20
  • 20 ÷ 2 = 10
  • 20 ÷ 10 = 2
Difficulty
medium

Write the fact family for 2, 2, 4:

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Answer: 2 × 2 = 4; 2 × 2 = 4; 4 ÷ 2 = 2; 4 ÷ 2 = 2

SubType
fact-family
Facts
  • 2 × 2 = 4
  • 2 × 2 = 4
  • 4 ÷ 2 = 2
  • 4 ÷ 2 = 2
Difficulty
medium

Write the fact family for 5, 4, 20:

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Answer: 5 × 4 = 20; 4 × 5 = 20; 20 ÷ 5 = 4; 20 ÷ 4 = 5

SubType
fact-family
Facts
  • 5 × 4 = 20
  • 4 × 5 = 20
  • 20 ÷ 5 = 4
  • 20 ÷ 4 = 5
Difficulty
medium

Write the fact family for 9, 4, 36:

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Answer: 9 × 4 = 36; 4 × 9 = 36; 36 ÷ 9 = 4; 36 ÷ 4 = 9

SubType
fact-family
Facts
  • 9 × 4 = 36
  • 4 × 9 = 36
  • 36 ÷ 9 = 4
  • 36 ÷ 4 = 9
Difficulty
medium

Write the fact family for 3, 1, 4:

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Answer: 3 + 1 = 4; 1 + 3 = 4; 4 - 3 = 1; 4 - 1 = 3

SubType
fact-family
Facts
  • 3 + 1 = 4
  • 1 + 3 = 4
  • 4 - 3 = 1
  • 4 - 1 = 3
Difficulty
medium