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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 518 · 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 58 =
  2. 2.Double 97 =
  3. 3.Half of 74 =
  4. 4.Half of 82 =
  5. 5.Double 31 =
  6. 6.Double 79 =
  7. 7.Double 93 =
  8. 8.Half of 164 =
  9. 9.Half of 68 =
  10. 10.Double 71 =
  11. 11.Half of 84 =
  12. 12.Double 48 =
  13. 13.Half of 72 =
  14. 14.Half of 104 =
  15. 15.Half of 194 =
  16. 16.Double 87 =
  17. 17.Double 51 =
  18. 18.Double 24 =
  19. 19.Half of 134 =
  20. 20.Double 26 =
  21. 21.Half of 108 =
  22. 22.Double 91 =
  23. 23.Double 99 =
  24. 24.Half of 172 =
  25. 25.Half of 78 =
  26. 26.Half of 60 =
  27. 27.Half of 136 =
  28. 28.Half of 142 =
  29. 29.Double 33 =
  30. 30.Double 68 =
  31. 31.Double 76 =
  32. 32.Double 78 =
  33. 33.Double 38 =
  34. 34.Double 64 =
  35. 35.Double 32 =
  36. 36.Half of 52 =
  37. 37.Half of 176 =
  38. 38.Half of 46 =
  39. 39.Half of 64 =
  40. 40.Half of 148 =

Answer key

  1. 116
  2. 194
  3. 37
  4. 41
  5. 62
  6. 158
  7. 186
  8. 82
  9. 34
  10. 142
  11. 42
  12. 96
  13. 36
  14. 52
  15. 97
  16. 174
  17. 102
  18. 48
  19. 67
  20. 52
  21. 54
  22. 182
  23. 198
  24. 86
  25. 39
  26. 30
  27. 68
  28. 71
  29. 66
  30. 136
  31. 152
  32. 156
  33. 76
  34. 128
  35. 64
  36. 26
  37. 88
  38. 23
  39. 32
  40. 74

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