The idea, step by step
Every place is ten times smaller
Moving one place to the right makes the place-value unit ten times smaller. One tenth is ten hundredths; one hundredth is ten thousandths. In , the three means three tenths, the zero means no hundredths, and the five means five thousandths.
The decimal point separates whole-number places from fraction places. It does not name a place itself. Read as forty-seven thousandths, or as zero point zero four seven. The zero in the tenths place keeps the four in the hundredths place.
| Ones | Tenths | Hundredths | Thousandths |
|---|---|---|---|
| 2 | 3 | 0 | 5 |
Build and rename decimal amounts
Expanded notation shows what each digit contributes: . You can also write . This makes the missing hundredths visible.
A zero at the end of a decimal does not change the amount: . A zero inside a number can change its value if removed. For example, and do not name the same amount.
A common trap
Reading 0.35 as three tenths and five thousandths.
Instead: The five is in the second place after the decimal point, so it means five hundredths. Five thousandths would be 0.005.
See the thinking
Read a measuring value
In metres, what value does the digit 7 have?
- The first place after the decimal point is tenths.
- The second place is hundredths. Seven is in that place.
- Seven hundredths is 0.07.
Build a number from parts
Write the decimal with six ones, two hundredths and nine thousandths.
- There are no tenths, so put zero in the tenths place.
- Place two in the hundredths position and nine in the thousandths position.
- Keep six in the ones place.
Check your understanding
Write forty-three thousandths as a decimal.
Show answer
There are zero tenths, four hundredths and three thousandths.
Your turn
6 questions · 10 marks · Work at your own pace.
Read the questions online
- What is the value of 8 in ?1 mark
- Write seven hundred and six thousandths as a decimal.1 mark
- Write in expanded decimal notation.2 marks
- Write a decimal with two ones, five hundredths and one thousandth.2 marks
- Are and equal? Explain with place value.2 marks
- Mila deletes the zero in and gets . Explain how the digit 4 changed value.2 marks
Read the worked solutions
Equivalent correct methods earn the corresponding marks. Include units where asked.
- What is the value of 8 in ?1 mark
Eight is in the hundredths place.
- Write seven hundred and six thousandths as a decimal.1 mark
Seven hundred and six thousandths is .
- Write in expanded decimal notation.2 marks
Three ones, four tenths, zero hundredths and six thousandths.
- Write a decimal with two ones, five hundredths and one thousandth.2 marks
No tenths are given, so use zero in the tenths place.
- Are and equal? Explain with place value.2 marks
Seven tenths is seventy hundredths or seven hundred thousandths. Trailing zeros rename the same value.
Yes. - Mila deletes the zero in and gets . Explain how the digit 4 changed value.2 marks
In 2.047 the four is in the second decimal place.
In 2.47 it is in the first decimal place.
It changed from four hundredths to four tenths, becoming ten times as large.
Curriculum reference & lesson scope
Australian Curriculum v9.0; SA Curriculum Mathematics 2026
Beyond hundredths; ordering/number lines; familiar fraction–decimal–percentage equivalents.
Official curriculum source ↗