Use the hundred square to find 10 more than 81.
Finding 10 more than 81 is the same as saying 81 add 10. One way to do this would be to start at 81 and count forward 10 squares on the hundred square: one, two, three, four, five, six, seven, eight, nine, 10. 81 add 10 is 91.
Did you notice that 91 is below 81 on the hundred square? This is another way to find 10 more than a number on a hundred square. The number below a given number on a hundred square is always 10 more.
10 more than 81 is 91.