Subtraction Copy the sums into your book and fill in the answers. Use a hundreds square to help 1. subtracting 10 20 – 10 = 25 – 10 = 88 – 10 = 92 – 10 = 66 – 10 = 19 – 10 = 75 – 10 = 99 – 10 = 2. subtracting 11 20 – 11 = 25 – 11 = 88 – 11 = 12 – 11 = 96 – 11 = 19 – 11 = 65 – 11 = 49 – 11 = 3. subtracting 12 20 – 75 – 28 – 72 – 66 – 89 – 55 – 49 – 12 = 12 = 12 = 12 = 12 = 12 = 12 = 12 = Extension - Make up some more subtraction sums of your own, take away 10, 11 or 12.