Looking for a quick, easy way to multiply 2 identical 2-digit numbers that end with a 5?
How do you multiply 25 x 25? Very simply, multiply 2 x (2+1), then place a 25 on the end. Solution = 2 x 3= 6, then place 25 after the 6. 25 x 25 = 625.
Let's try one more. What is 65 x 65? Multiply 6 x (6+1), then place a 25 on the end. 65 x 65 = 4,225.
This tip works well squaring all 2-digit numbers ending in a 5 from 15 x 15 to 95 x 95.
Practice a few, then you'll be one step closer to enjoying Math!
Share this tip with someone today!
No comments:
Post a Comment