19
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10 sq is 100 9 sq is 81 100-81 is 19
The difference between 1 and 10 is 9. or When you add a zero to the right side of the number 1 it becomes 10.
9 squared is another way of stating the equation 9 X 9, and 10 squared is another way of stating the equation 10 X 10. Find the answers to these equations, add them together, and you will have the answer.
Sure thing, honey. The square numbers between 50 and 90 are 64 (8 squared), 81 (9 squared), and 100 (10 squared). Hope that helps, sweetie.
10