hard Set 9 Form Exercise

Start at 21. Follow the chain: -2, +4, +13, -12, +17. What is the result after step 4?

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Answer: 24

StartNumber
21
Steps
  • {"op":"-","value":2}
  • {"op":"+","value":4}
  • {"op":"+","value":13}
  • {"op":"-","value":12}
  • {"op":"+","value":17}
Values
  • 21
  • 19
  • 23
  • 36
  • 24
  • 41
MissingStep
3

Start at 12. Follow the chain: ×3, -18, +8, +1, ×3. What is the result after step 4?

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Answer: 27

StartNumber
12
Steps
  • {"op":"\u00d7","value":3}
  • {"op":"-","value":18}
  • {"op":"+","value":8}
  • {"op":"+","value":1}
  • {"op":"\u00d7","value":3}
Values
  • 12
  • 36
  • 18
  • 26
  • 27
  • 81
MissingStep
3

Start at 30. Follow the chain: ×2, -6, -7, -12, ÷5. What is the result after step 4?

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Answer: 35

StartNumber
30
Steps
  • {"op":"\u00d7","value":2}
  • {"op":"-","value":6}
  • {"op":"-","value":7}
  • {"op":"-","value":12}
  • {"op":"\u00f7","value":5}
Values
  • 30
  • 60
  • 54
  • 47
  • 35
  • 7
MissingStep
3

Start at 25. Follow the chain: ÷5, +7, ×3, ×4, +6. What is the result after step 2?

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Answer: 12

StartNumber
25
Steps
  • {"op":"\u00f7","value":5}
  • {"op":"+","value":7}
  • {"op":"\u00d7","value":3}
  • {"op":"\u00d7","value":4}
  • {"op":"+","value":6}
Values
  • 25
  • 5
  • 12
  • 36
  • 144
  • 150
MissingStep
1

Start at 23. Follow the chain: +1, +11, +4, +12, ÷3. What is the result after step 5?

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Answer: 17

StartNumber
23
Steps
  • {"op":"+","value":1}
  • {"op":"+","value":11}
  • {"op":"+","value":4}
  • {"op":"+","value":12}
  • {"op":"\u00f7","value":3}
Values
  • 23
  • 24
  • 35
  • 39
  • 51
  • 17
MissingStep
4

Start at 15. Follow the chain: ×4, -20, +6, ÷2, -4. What is the result after step 1?

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Answer: 60

StartNumber
15
Steps
  • {"op":"\u00d7","value":4}
  • {"op":"-","value":20}
  • {"op":"+","value":6}
  • {"op":"\u00f7","value":2}
  • {"op":"-","value":4}
Values
  • 15
  • 60
  • 40
  • 46
  • 23
  • 19
MissingStep
0

Start at 25. Follow the chain: -13, ×3, ÷2, ÷9, ×3. What is the result after step 4?

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Answer: 2

StartNumber
25
Steps
  • {"op":"-","value":13}
  • {"op":"\u00d7","value":3}
  • {"op":"\u00f7","value":2}
  • {"op":"\u00f7","value":9}
  • {"op":"\u00d7","value":3}
Values
  • 25
  • 12
  • 36
  • 18
  • 2
  • 6
MissingStep
3

Start at 20. Follow the chain: -3, -15, +8, ÷2, -1. What is the result after step 2?

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Answer: 2

StartNumber
20
Steps
  • {"op":"-","value":3}
  • {"op":"-","value":15}
  • {"op":"+","value":8}
  • {"op":"\u00f7","value":2}
  • {"op":"-","value":1}
Values
  • 20
  • 17
  • 2
  • 10
  • 5
  • 4
MissingStep
1