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how does multiplication and division undo each other
Operations that undo each other include: addition and subtraction multiplication and division powers and roots
Multiplication and division are related because they are the inverse of each other. 9 x 4 = 36 36/4 = 9
Inverse Operations: Divison undoes multiplication. Addition undoes subtraction. Subtraction undoes addition. Multiplication undoes division.
Your question is a little confusing. If you are asking which gets done first ... addition/subtraction or multiplication/division ... the multiplication/division is done first. In other words, in 1 + 4 / 2, you divide 4 by 2 first, then add 1. So the answer is 3.