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to ensure and re-check your work you use the opposite signs (addition & subtractions, multiplication & division)
e.g.
__= blank
10+ _ = 12
_=2
to check: you take the answer (in this case 12) and subtract (because its the opposite of addition) by the blank you filled in (2 in this case.
therefore, 12-2=10 so we know its correct :-)
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What type of addition is used to check addition?
Subtraction is used to check addition.
Why can you use addition to check your subtraction?
Addition is the opposite of subtraction. For example, 24 - 9 = 15. If you want to check your answer, add 9 + 15. It equals 24, so your answer is correct.
Which calculations come last in the order of operations?
addition and subtraction
How do you check your answers in addition and subtraction?
for addition you take the sum and subtract one of the numbers being added from it and for subtraction you add the difference with the second number being subtracted so it equals the first number
What comes first in pemdas addition or subtraction?
d-a-s division-addition-subtraction
