What is the sum of the factors of 21?
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.
Let's see what the factors of 21 are:
Well, 21= 121, 21=37, and that's it!
Now to sum them up, 1+3+7+21 = 32. So the answer here is 32.
DD
Related Maths 11 Plus answers
All answers ▸A round cake is shared between Abi, Elvira and Tina. The angle cut at the centre of the cake for each piece is that person’s age multiplied by 10. Abi 9 years old and Elvira is 14 years old. How old is Tina?
A is the point with coordinates (5,8) and B is the point with coordinates (1,-2). Find the coordinates of the midpoint of AB.
I want to pave my patio, which has dimensions of 6m by 8m. I'm going to pave it with stones that have dimensions of 50cm by 50cm. Each tile costs £1.50. How much will paving my patio cost me?
Put the next fractions in an increasingly order: 1/2, 3/4, 2/3, 5/6