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Near Doubles Addition Worksheet

Mental maths lesson 3: Near doubles · Set 805 · 40 questions
TalentJR

How to do it in your head (Double and adjust): Find the smaller number and how much bigger the other one is. Double the smaller number. Add the difference.

NameDateTime takenScore ___ / 40
  1. 1.11 + 10 =
  2. 2.9 + 10 =
  3. 3.19 + 20 =
  4. 4.12 + 11 =
  5. 5.21 + 22 =
  6. 6.10 + 12 =
  7. 7.20 + 19 =
  8. 8.27 + 28 =
  9. 9.21 + 20 =
  10. 10.18 + 19 =
  11. 11.26 + 27 =
  12. 12.16 + 17 =
  13. 13.27 + 26 =
  14. 14.26 + 28 =
  15. 15.9 + 8 =
  16. 16.25 + 27 =
  17. 17.17 + 19 =
  18. 18.9 + 11 =
  19. 19.13 + 12 =
  20. 20.29 + 30 =
  21. 21.22 + 23 =
  22. 22.7 + 8 =
  23. 23.15 + 16 =
  24. 24.28 + 30 =
  25. 25.15 + 17 =
  26. 26.15 + 14 =
  27. 27.6 + 7 =
  28. 28.24 + 26 =
  29. 29.18 + 20 =
  30. 30.24 + 25 =
  31. 31.12 + 14 =
  32. 32.24 + 23 =
  33. 33.25 + 24 =
  34. 34.16 + 15 =
  35. 35.14 + 16 =
  36. 36.6 + 8 =
  37. 37.25 + 26 =
  38. 38.23 + 24 =
  39. 39.17 + 18 =
  40. 40.17 + 16 =

Answer key

  1. 21
  2. 19
  3. 39
  4. 23
  5. 43
  6. 22
  7. 39
  8. 55
  9. 41
  10. 37
  11. 53
  12. 33
  13. 53
  14. 54
  15. 17
  16. 52
  17. 36
  18. 20
  19. 25
  20. 59
  21. 45
  22. 15
  23. 31
  24. 58
  25. 32
  26. 29
  27. 13
  28. 50
  29. 38
  30. 49
  31. 26
  32. 47
  33. 49
  34. 31
  35. 30
  36. 14
  37. 51
  38. 47
  39. 35
  40. 33

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