If
Solve the following subtraction problem:
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If
Solve the following subtraction problem:
To solve this problem, we'll use the substitution method for the subtraction equation provided:
Therefore, the solution to the problem is .
Add fifty units to the number 31.
What is the resulting number?
The yellow box is a symbol representing the same value in both equations. Since the first equation tells us the yellow box equals 7, we use that same value everywhere the symbol appears.
Look at the order in the equation! In , you subtract the yellow box value (7) from 82, giving you 82 - 7 = 75.
This happens when you ignore the subtraction sign! Always pay attention to the operation symbol. The problem shows subtraction (-), not addition (+).
Yes! You can work backwards: 75 + 7 = 82. If your answer plus 7 equals the original number (82), then you solved it correctly.
These come from estimation errors. 70 would mean 82 - 12 = 70, and 80 would mean 82 - 2 = 80. Neither gives us the required result of 7 when we check our work.
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