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Question
Solve 11−2 using addition.
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Solution
11−2 can be expressed by replacing the subtraction sign with addition sign and reversing the sign of second number.
⇒11−2=11+(−2)
We solve this using chip model.
- 11 represents eleven positive chips.
- (-2) represents two negative chips.
⇒11+(−2) : Add two negative chips to eleven positive chips.
Two positive chips get cancelled out by two negative chip.
As a result, answer is 9.
⇒11−2=11+(−2)
We solve this using chip model.
- 11 represents eleven positive chips.
- (-2) represents two negative chips.
⇒11+(−2) : Add two negative chips to eleven positive chips.Two positive chips get cancelled out by two negative chip.
As a result, answer is 9.
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