Mathematics · Grades 3–6
Decimal place value without shortcuts
Tenths, hundredths and thousandths are different-sized units.
Understand the idea
Align places
Tenths, hundredths and thousandths are different-sized units.
Zeros can help
Appending zeros to the right of a terminating decimal does not change its value.
Estimate first
A rough answer helps detect misplaced decimal points.
Worked examples
Which value equals 0.60?
Six tenths is the same as sixty hundredths.
0.6
Write 7 tenths plus 4 hundredths as a decimal.
0.7 + 0.04 = 0.74.
0.74
Try it yourself
Which is greatest: 0.8, 0.79, 0.805 or 0.08?
- 0.79
- 0.805
- 0.8
- 0.08
Calculate 1.2 − 0.35.
Which interval contains 3.047?
- between 3.04 and 3.05
- between 3.4 and 3.5
- between 3.00 and 3.01
- between 30 and 31
Explain why 0.4 is not smaller than 0.35 merely because it has fewer digits.
Answers and marking notes
Answers and marking notes
- 0.805
Write 0.800, 0.790, 0.805 and 0.080 to compare.
- 0.85
1.20 − 0.35 = 0.85.
- between 3.04 and 3.05
3.040 < 3.047 < 3.050.
- 0.4 = 0.40, which is greater than 0.35. Decimal length alone does not determine size.
Credit a place-value or number-line justification.
Preview material · independent educational review required. Grade bands are approximate, not official curriculum alignment.