Decimals: Tenths and Hundredths
Meet the decimal point: 0.5, 0.25 and how decimals are fractions in disguise.
โฑ๏ธ Micro Plan โ 4 short parts ยท about 20 min in total
- 1What Is It?5 min
- 2See It with Pictures5 min
- 3Practice5 min
- 4Quiz Time5 min
๐ฏ Learning objectives
After completing this lesson, the child should be able to:
- Understand place value after the decimal point
- Convert simple fractions to decimals
- Add and subtract decimals with one decimal place
Decimals are fractions wearing different clothes. Meet the decimal point!
Meet the decimal point
Instead of writing 1/2, we can write 0.5. The little dot is the decimal point โ everything after it is smaller than one whole.
Place value after the point
In 3.75: the 3 means 3 whole ones, the 7 means 7 tenths, the 5 means 5 hundredths.
Fractions and decimals are twins
| Fraction | Decimal |
|---|---|
| 1/2 | 0.5 |
| 1/4 | 0.25 |
| 3/4 | 0.75 |
| 1/10 | 0.1 |
Adding decimals
Line up the decimal points, then add column by column:
0.5 + 0.3 = 0.8 ยท 1.2 + 0.7 = 1.9
Practice
Decimals in real life
Money ($0.50), race times (12.3 seconds), temperatures (36.6ยฐ) โ decimals measure the in-between world!