Question

Erin solved the problem. 1,000-479=521 Which equation did Erin use ro check his answer?​

Answer 1

Hi there!

equation:521+479=1000..

If your subtract 479 from 1,000, in addition form it should be the opposite..

we also know that adding’s oppsite is subtracting and multiplyin’s opposite is dividing..

Therefore, the equation Erin used to check his answer would be 521+479=1,000..