Lesson 1 of 16
An expression and its value
Show on a big screenA shop chit — a small bill — says 3 × 25 + 40. How much is it?
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Step 1 of 4
- The chit: 3 × 25 + 40.
- First job: 3 × 25 = 75.
- Second job: 75 + 40 = 115.
- The value is 115.
The rule
The chit is worth 115.
3 × 25 + 40 is an expression. It is numbers and signs, such as + and ×, written out.
Its value is the one number it equals. Here the value is 115.
The equals sign = says both sides have the same value.
| Expression | Value |
|---|---|
| 13 + 2 | 15 |
| 4 × 6 | 24 |
| 48 ÷ 2 | 24 |
| 3 × 25 + 40 | 115 |
4 × 6 and 48 ÷ 2 are two expressions with one value. So 4 × 6 = 48 ÷ 2.
Try the lab to finish this lesson.