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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 88 · 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.Half of 136 =
  2. 2.Double 92 =
  3. 3.Half of 52 =
  4. 4.Half of 68 =
  5. 5.Half of 140 =
  6. 6.Double 48 =
  7. 7.Half of 146 =
  8. 8.Double 59 =
  9. 9.Half of 122 =
  10. 10.Double 64 =
  11. 11.Double 62 =
  12. 12.Double 91 =
  13. 13.Double 56 =
  14. 14.Double 36 =
  15. 15.Half of 118 =
  16. 16.Half of 108 =
  17. 17.Half of 198 =
  18. 18.Double 29 =
  19. 19.Double 98 =
  20. 20.Half of 66 =
  21. 21.Half of 80 =
  22. 22.Half of 188 =
  23. 23.Half of 104 =
  24. 24.Double 19 =
  25. 25.Half of 44 =
  26. 26.Half of 78 =
  27. 27.Double 21 =
  28. 28.Double 51 =
  29. 29.Half of 166 =
  30. 30.Double 81 =
  31. 31.Half of 92 =
  32. 32.Half of 194 =
  33. 33.Double 77 =
  34. 34.Half of 30 =
  35. 35.Double 31 =
  36. 36.Double 38 =
  37. 37.Half of 36 =
  38. 38.Double 43 =
  39. 39.Half of 72 =
  40. 40.Double 18 =

Answer key

  1. 68
  2. 184
  3. 26
  4. 34
  5. 70
  6. 96
  7. 73
  8. 118
  9. 61
  10. 128
  11. 124
  12. 182
  13. 112
  14. 72
  15. 59
  16. 54
  17. 99
  18. 58
  19. 196
  20. 33
  21. 40
  22. 94
  23. 52
  24. 38
  25. 22
  26. 39
  27. 42
  28. 102
  29. 83
  30. 162
  31. 46
  32. 97
  33. 154
  34. 15
  35. 62
  36. 76
  37. 18
  38. 86
  39. 36
  40. 36

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