**Elementary School Number Sense Lesson 29: Squaring a Number Just below 50**

This concept appeared

**2 times**this year--both at

**question # 73**.

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**Number Dojo Level: 156**

Our first step will be to find the difference between the number and 50. We’ll then need to subtract the number

*from*50 and square that difference.

**How to Solve:**

- Subtract the number from 50. Square this difference to get your last 2 digits.
- Subtract this difference from 25 to find your first 2 digits.

**Example 1: 42 x 42 = ___**

- 50 – 42 =
**8**; 82 =**64**. Write this down. - 25 – 8 =
**17**; write this in front. - Your answer is
**1764**.

**Example 2: 46 x 46 = ___**

- 50 – 46 =
**4**; 42 =**16**. Write this down. - 25 – 4 =
**21**; write this in front. - Your answer is
**2116**.

**Example 3: 48 x 48 = ___**

- 50 – 48 =
**2**; 22 =**4**. Write this as**04**. - 25 – 2 =
**23**; write this in front. - Your answer is
**2304**.

**Example 4: 43 x 43 = ___**

- 50 – 43 =
**7**; 72 =**49**. Write this down. - 25 – 7 =
**18**; write this in front. - Your answer is
**1849**.

**Example 5: 47 x 47 = ___**

- 50 – 47 =
**3**; 32 =**9**. Write this as**09**. - 25 – 3 =
**22**; write this in front. - Your answer is
**2209**.

**Here's a free worksheet to help you practice Square41-50:**

square41-50.pdf |

**Up Next for Elementary School: Mult75var**