STRAIGHT STATISTICS

SQUARING SHORTCUTS

Squaring numbers can be fun and easy. Here are some shortcuts to help you:

SQUARING A NUMBER ENDING IN 0

Squaring whatever number comes before zero, then double the zeros.

Example 1: 80 is the number you want to square  → Square the nonzero number.

8 x 8 = 64
Double the zeros.
00

Answer: 6400

Example 2: 1200 is the number you wan to square → Square the nonzero numbers.

12 x 12 = 144

Double the zeros.

0000

Answer: 1 440 000

SQUARING A NUMBER BETWEEN 11 AND 19 

Example 1: 17 is the number you wan to square.

Step 1: Square the ones digit

17^2 → 7 x 7 = 49

Use the 9.

Carry the 4.

Step 2: Multiply the ones digit by 2.

17^2 → 7 x 2 = 14

Use the 4.

Add the first carry.

4 + 4 = 8

Keep the second carry: 1

Step 3: Use the tens digit of the original number.

17^2 → 1

Add the carry: 1

1 + 1 = 2

Answer: 289


By: Andrea Beatrice Pechueco