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Well, the normal way to check a division problem is with multiplication... if you divide 21 by 7 and come up with three, then you check that by multiplying 7 and 3, to get 21. But if you're on an abacus or something, I suppose you could say, "I came up with a result of three, which means three sevens", and then add 7 + 7 + 7 to get 21.
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Why do you check addition with subtraction?
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 :-)
How do you solve multi step equations?
Solving • Work backward to isolate the variable and solve the equation.Multi-Step • Use subtraction to undo addition, and use addition to undo subtraction.Equations • Use multiplication to undo division, and use division to undo multiplication.
Does addition or division come first?
division
The reverse of multiplication is?
Division
What type of addition is used to check addition?
Subtraction is used to check addition.
