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Subtraction

By [Name]

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What is 243 - 86 ?

What is 243 - 86?. First this problem is a subtraction problem. If you don’t know the answer to solving this question or if you don’t know what subtraction is let me explain.

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What is Subtraction?

Subtraction is a math strategy used to solve questions. For an example 23 - 13. There are two types of ways to solve subtraction problems and they are Reversibility and Compensation. They are the main ways of solving subtraction problems.

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Reversibility

Reversibility is the opposite of subtracting which is addition and also gives you the answer to the problem. For an example 189 + ? = 398. It has addition but the addition is helping by giving the answer to the subtraction problem you are solving.

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Compensation

Compensation is the normal way of subtracting. For an example 329 - 100 = ?. Compensation is just taking away from the first digits from the first number in the problem.

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Solve All Problems From Each Strategy Box

Reversibility

Compensation

Answers

Mixed Problems

and do not go to answers until Mixed problems, Reversibility and Compensation are all completed.

Please do not use any technology to solve these question as this is a learning activity.

and do not go to answers until Mixed problems, Reversibility and Compensation are all completed.

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Reversibility Problems

72 + ? = 100

360 + ? = 500

556 + ? = 681

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Compensation Problems

46 - 27 = __

184 - 56 = ___

539 - 214 = ___

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Mixed Problems

36 + ? = 50

429 - 234 = ___

71 + ? = 95

81 - 46 = ___

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Answers

Reversibility:

1: 28. 2: 140. 3: 125.

Compensation:

1: 19. 2: 28. 3: 325.

Random:

1: 14. 2: 195. 3: 24. 4: 35.

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Do Not Remove Unless All Problems Are Solved