First comes multiply then comes divide.
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Multiply cm by 10 to get mm. Divide mm by 10 to get cm.
These are called operators. When doing a sum with more than one operator the rule is to multiply and divide first, and then do any addition or subtraction. A simple way to remember the order is "BODMAS." 'Brackets', 'other', 'division', 'multiplication', 'addition' and 'subtraction'. (Other refers to powers and indices)
In the sequence 20 5 30 6 42 7, the rule is divide by 4 then multiply by 6, divide by 5 then multiply by 7, divide by 6 then multiply by 8 since each time the number by which you multiply or divide by increases by 1. Since the last multiplication was by 7, we know the next will be by 8. Therefore, the answer you get for the next number in the sequence is 56 (7x8=56).
product is to multiply and quotient is to divide.!
When you divide or multiply two negative numbers they cancel each other out and you have a positive answer. We are measuring relationships instead of moving on a number line like addition or subtraction.