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Adding decimals worksheets

Twenty problems adding decimals to the hundredths, such as 7.93 + 9.82, stacked with the points lined up, in three versions with answer keys.

Decimal operations: add decimals to hundredths

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Sheet AFree at teach.peabody.kids

Decimal operations: add decimals to hundredths

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Decimal operations: add decimals to hundredths

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Sheet CFree at teach.peabody.kids

Answer key

Sheet A

  1. 17.81
  2. 13.13
  3. 12.84
  4. 6.41
  5. 12.35
  6. 8.21
  7. 14.72
  8. 11.68
  9. 7.82
  10. 17.29
  11. 6.94
  12. 15.00
  13. 13.56
  14. 14.40
  15. 8.73
  16. 8.63
  17. 14.44
  18. 12.13
  19. 16.70
  20. 12.84

Sheet B

  1. 10.63
  2. 10.45
  3. 8.75
  4. 14.13
  5. 13.32
  6. 3.61
  7. 15.58
  8. 6.98
  9. 5.25
  10. 12.68
  11. 8.30
  12. 11.03
  13. 9.40
  14. 4.90
  15. 16.97
  16. 13.44
  17. 11.50
  18. 15.27
  19. 15.05
  20. 14.70

Sheet C

  1. 17.29
  2. 6.95
  3. 16.27
  4. 9.48
  5. 8.67
  6. 14.92
  7. 11.02
  8. 7.93
  9. 9.83
  10. 17.35
  11. 13.65
  12. 14.24
  13. 6.03
  14. 9.63
  15. 6.50
  16. 14.06
  17. 6.86
  18. 16.24
  19. 7.52
  20. 13.67
Answer keyFree at teach.peabody.kids

Decimal operations: 20 problems a sheet, 3 versions that do not repeat each other where the numbers allow.

How to use it

  1. Look at the sheet: it is a real, printable sheet. Switch between Sheet A, B and C, or press New numbers (N) for a fresh set.
  2. Change how many problems, how many versions, and whether the key prints. Settings stay in this browser; Share copies a link that rebuilds the same sheets.
  3. Press Print sheet A and key, or Print all. The answer key prints on its own page, so you can keep it back.

Ideas for class

  • Print the stacked layout so the points line up, and draw a vertical line through them on the first sheet.
  • Ask for an estimate to the nearest whole number before each answer.
  • Compare a decimal sum with a money sum on the money sheet, since students already know that 7.93 is dollars and cents.

Related

Questions

Do the numbers always have two decimal places?

Yes on this page, so the points line up in the stacked layout. For tenths only, choose Add and subtract tenths in the maker, which is the fourth-grade version.

Why does the key write 6.00 and not 6?

Keeping both places shows the answer to the same precision as the problem and makes it easier to compare with a student's work. Either is correct.

Are the answer keys checked?

Each answer is worked out by the code that wrote the problem, and our tests recompute every answer a second way and compare. Please still look over the key before you grade a class set.

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What this worksheet covers

Adding decimals is the same as adding whole numbers once the decimal points are lined up. Each problem here has two numbers with two decimal places between about 1 and 10, stacked so that the points sit in a column. Sums run up to nearly 20, so many need a carry across the point, and the key keeps both decimal places, writing 6.00 rather than 6.

Who it is for

Fifth grade. Common Core 5.NBT.B.7 asks students to add, subtract, multiply and divide decimals to hundredths using place value and the relationship between operations. Students should be secure with whole-number addition and with place value to hundredths.

Adding decimals to the hundredths · grade 5

A worked example

7.93 + 9.82. Hundredths: 3 + 2 = 5. Tenths: 9 + 8 = 17, write 7 and carry 1. Ones: 7 + 9 + 1 = 17. The sum is 17.75. Estimate: 8 + 10 = 18, so 17.75 is reasonable.

Mistakes to watch for

  • Lining up the right-hand digits instead of the points, which only works when both numbers have the same number of places. Here they do, but the habit matters.
  • Dropping the point in the answer or putting it in the wrong place. Estimating reveals the problem.

Make it your own

This sheet is one setting of the math worksheet generator. Open it there to change the skill, the range of numbers or the heading, or to mix several skills on one sheet.