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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 754 · 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 88 =
  2. 2.Double 17 =
  3. 3.Half of 186 =
  4. 4.Double 56 =
  5. 5.Double 35 =
  6. 6.Double 92 =
  7. 7.Half of 144 =
  8. 8.Half of 68 =
  9. 9.Double 71 =
  10. 10.Double 69 =
  11. 11.Half of 44 =
  12. 12.Half of 102 =
  13. 13.Half of 58 =
  14. 14.Half of 40 =
  15. 15.Half of 184 =
  16. 16.Double 62 =
  17. 17.Half of 190 =
  18. 18.Half of 28 =
  19. 19.Double 79 =
  20. 20.Double 24 =
  21. 21.Half of 182 =
  22. 22.Half of 76 =
  23. 23.Half of 164 =
  24. 24.Double 44 =
  25. 25.Half of 154 =
  26. 26.Half of 64 =
  27. 27.Half of 192 =
  28. 28.Double 61 =
  29. 29.Double 83 =
  30. 30.Double 94 =
  31. 31.Double 68 =
  32. 32.Double 55 =
  33. 33.Half of 50 =
  34. 34.Half of 150 =
  35. 35.Half of 174 =
  36. 36.Double 67 =
  37. 37.Double 81 =
  38. 38.Half of 46 =
  39. 39.Double 63 =
  40. 40.Half of 136 =

Answer key

  1. 44
  2. 34
  3. 93
  4. 112
  5. 70
  6. 184
  7. 72
  8. 34
  9. 142
  10. 138
  11. 22
  12. 51
  13. 29
  14. 20
  15. 92
  16. 124
  17. 95
  18. 14
  19. 158
  20. 48
  21. 91
  22. 38
  23. 82
  24. 88
  25. 77
  26. 32
  27. 96
  28. 122
  29. 166
  30. 188
  31. 136
  32. 110
  33. 25
  34. 75
  35. 87
  36. 134
  37. 162
  38. 23
  39. 126
  40. 68

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