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Let's break down what this question is asking. It wants the sum of, meaning the value added together, of the factors of, meaning the whole numbers that you can divide into 21 and still get a whole number, 21...

First, we need to look for a pattern. What are we needing to do to get from one number to the next? As you can see, we are multiplying each number by two to get the next number. 8 multiplied by 2 is 16, and ...

You start by dividing 420 by whichever numbers you know that it is divisible by. 420 is obviously divisible by 10 so you can start with 10 x 42. Then, you factorise 10 and 10 = 2 x 5, so now we know 420 = 2 ...

To solve this equation we want to find the value of one unknown, x. The solution will be x = ___. So first we need to put all the terms with x on one side of the =, and all the constants on the other side. T...

A third is 3 divisions of 1, for example cutting 1 muffin into thirds would give 3 pieces. So if you had 12 muffins and cut each muffin into 3 pieces you would have 36 pieces. Therefore there are 36 thirds i...