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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 509 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 27 =
  2. 2.Double 79 =
  3. 3.Double 19 =
  4. 4.Half of 126 =
  5. 5.Double 54 =
  6. 6.Double 32 =
  7. 7.Half of 66 =
  8. 8.Half of 26 =
  9. 9.Half of 94 =
  10. 10.Double 85 =
  11. 11.Half of 62 =
  12. 12.Half of 92 =
  13. 13.Double 95 =
  14. 14.Double 61 =
  15. 15.Half of 186 =
  16. 16.Double 71 =
  17. 17.Double 21 =
  18. 18.Double 44 =
  19. 19.Half of 184 =
  20. 20.Double 23 =
  21. 21.Double 64 =
  22. 22.Double 89 =
  23. 23.Double 58 =
  24. 24.Half of 80 =
  25. 25.Double 47 =
  26. 26.Half of 58 =
  27. 27.Half of 174 =
  28. 28.Double 57 =
  29. 29.Double 51 =
  30. 30.Double 92 =
  31. 31.Half of 42 =
  32. 32.Half of 108 =
  33. 33.Double 65 =
  34. 34.Half of 142 =
  35. 35.Half of 194 =
  36. 36.Half of 198 =
  37. 37.Double 24 =
  38. 38.Double 67 =
  39. 39.Half of 40 =
  40. 40.Half of 68 =

Answer key

  1. 54
  2. 158
  3. 38
  4. 63
  5. 108
  6. 64
  7. 33
  8. 13
  9. 47
  10. 170
  11. 31
  12. 46
  13. 190
  14. 122
  15. 93
  16. 142
  17. 42
  18. 88
  19. 92
  20. 46
  21. 128
  22. 178
  23. 116
  24. 40
  25. 94
  26. 29
  27. 87
  28. 114
  29. 102
  30. 184
  31. 21
  32. 54
  33. 130
  34. 71
  35. 97
  36. 99
  37. 48
  38. 134
  39. 20
  40. 34

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