**Elementary School Number Sense Lesson 21: Multiplying by 143**

This concept appeared

**3 times**on elementary tests this year, with a median placement at

**question # 57**.

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**Number Dojo Level: 143**

The main thing to know for these problems is that 143 is exactly

**1001 ÷ 7**. So divide the other number by 7, and then multiply this result by 1001.

**Example 1: 143 x 14 = ___**

- Divide 14 by 7, and then multiply by 1001.
- 14 ÷ 7 =
**2** - 2 x 1001 =
**2002**

**Example 2: 143 x 56 = ___**

- 56 ÷ 7 =
**8** - 8 x 1001 =
**8008**

**Example 3: 143 x 91 = ___**

- 91 ÷ 7 =
**13** - 13 x 1001 =
**13013**

**Example 4: 143 x 2.8 = ___**

- 2.8 ÷ 7 =
**.4** - .4 x 1001 =
**400.4**

**Example 5: 143 x 4200 = ___**

- 4200 ÷ 7 =
**600** - 600 x 1001 =
**600600**

**Example 6: 286 x 42 = ___**

- 286 = 143 x 2, so we’ll double our normal result.
- 42 ÷ 7 =
**6** - 6 x 1001 =
**6006** - 6006 x 2 =
**12012**

**Up Next for Elementary School: ConvDeci%**