Squaring of numbers that end in 1 or 9
The trick is to multiply the whole numbers on the either sides of the number that you are squaring and then add 1.
Have fun with the trick
212 = 441
As the number to be squared ends in 1.
- Multiply the two whole numbers on the either
sides of 21.20 x 22 = 440
- Add 1 to 440440 + 1 = 441
Let’s try one more:
192 = 361
As the number to be squared ends in 9.
- Multiply the two whole numbers on the either
sides of 19.18 x 20 = 360
- Add 1 to 360360 + 1 = 361
Time for you to try
| 112 | = | |
| 512 | = | |
| 312 | = | |
| 392 | = | |
| 292 | = | |
| 992 | = |