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Adding Decimals Place Value
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Adding Decimals Place Value
Read each question carefully. Line up decimal points when adding, and show your working where there is space.
Decimal place value
1.In 6.4, which digit is in the tenths place?
- 6
- 4
- Both digits
2.Which descriptions represent 2.5? Choose all that are correct.
- 2 ones and 5 tenths
- 25 tenths
- 2 tenths and 5 ones
- 20 tenths and 5 tenths
3.In 8.3, write the digit in the ones place and then the digit in the tenths place.
Adding tenths and ones
4.Work out 3.8 + 2.7. First add the tenths: 8 tenths + 7 tenths = ___ tenths = ___ whole and ___ tenths. Then add the ones, including any whole carried over. What is the total?
5.Add 4.3 + 3.6. Line up the decimal points.
6.Add 7.5 + 1.8. Line up the decimal points.
7.Add 6.2 + 2.4. Line up the decimal points.
Decimal addition in everyday situations
8.Hemi has $5.40 and finds another $2.80 in her bag. How much money does she have now?
9.Wiremu walks 1.7 kilometres before lunch and 2.6 kilometres afterwards. What distance does he walk altogether?
10.A small parcel has a mass of 2.3 kg and a second parcel has a mass of 3.9 kg. What is their combined mass?
Challenge
11.Match each addition to its total.
- 6.7 + 2.8
- 4.5 + 3.8
- 7.1 + 1.2
- 5.9 + 2.6
- 8.3
- 8.3
- 9.5
- 8.5
12.Explain why the tenths digits must be added to tenths, rather than to the ones digits.
13.Write your own addition of two one-decimal-place numbers that requires regrouping 10 or more tenths into a whole. Solve it.
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