Asked
1 year ago

Viewed
262065 times

**Answer:**

225

**Step-by-step explanation:**

**15x15=225**

**There is a cool trick you can do. Lets take 28 and square it.**

**First you round the number up. 28 rounded is 30. You rounded up by 2 (30-28=2) so you minus 2 from 28.**

**You are left with these two numbers, 26 and 30. Add a zero to the 26.**

**You now have 260 and 3 (you remove 0 on the 30 since you added it to the 26)**

**Then you multiply by 3.**

**260x3=780**

**Then you add the square of the number you rounded up too, which is 2.**

**You are left with this equation.**

**(2^2)+780= 784**

**28x28=784.**

**This works for numbers below 100 and integers**

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