Video: Identifying the Equation Needed to Solve Questions Involving Multiplicative Comparison

A coat costs 12 times more than a pair of shorts. The shorts cost $7. If you want to know the price of the coat, which equation do you need to solve to find the answer? [A] 12 × 7 = ? [B] 12 × ? = 7 [C] ? × 7 = 12 [D] 12 + 7 = ? [E] 12 − 7 = ?.

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Video Transcript

A coat costs 12 times more than a pair of shorts. The shorts cost seven dollars. If you want to know the price of the coat, which equation do you need to solve to find the answer? Is it 12 multiplied by seven equals the missing number, is it 12 multiplied by a missing number equals seven or a missing number multiplied by seven equals 12, is it 12 plus seven equals a missing number or 12 minus seven equals a missing number.

So how could we solve this word problem? Now, let’s see if there any key numbers and words in the question. And we have two numbers: number 12 and number seven. So we found our two key numbers: 12 and seven.

Now, we need to decide which operation to use: multiply, plus, or minus. To help do this, we need to look at the question again and see if there are any key words that mean times, plus, or minus.

Did you spot the word times? Times is the same as multiply. So we can write our operation. So to work out the price of the coat, the equation we need to solve is 12 multiplied by seven. We chose this equation because 12 times seven will help us to find the answer.

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