Video: KS2-M16S • Paper 3 • Question 14

Here is a number pyramid. The number in a box is the product of the two numbers below it. Write the missing numbers.

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Video Transcript

Here is a number pyramid. The number in a box is the product of the two numbers below it. Write the missing numbers.

We know that 22.5, the number at the top of the pyramid, is the product of the two numbers below it, a missing number and five. We can use the inverse to find the missing number. 22.5 divided by five will tell us the missing number. 22 divided by five is four, remainder two. And 25 divided by five is five. 4.5 multiplied by five equals 22.5. So 4.5 is our first missing number in the pyramid.

This missing number is the number we multiply by two to give us the number above, which is 4.5. So if we divide 4.5 by two, that will tell us this missing number. Four divided by two is two, and 0.5 divided by two is 0.25. So the missing number is 2.25.

This missing number multiplied by two gives us a product of five. What do we multiply by two to give us a total of five? Half of five is 2.5. So the missing numbers in the pyramid are 4.5, 2.25, and 2.5.

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