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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 70 · 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 188 =
  2. 2.Half of 114 =
  3. 3.Half of 178 =
  4. 4.Double 76 =
  5. 5.Double 65 =
  6. 6.Half of 32 =
  7. 7.Double 23 =
  8. 8.Double 48 =
  9. 9.Half of 56 =
  10. 10.Double 19 =
  11. 11.Double 71 =
  12. 12.Double 37 =
  13. 13.Double 61 =
  14. 14.Double 95 =
  15. 15.Half of 46 =
  16. 16.Half of 118 =
  17. 17.Half of 78 =
  18. 18.Half of 184 =
  19. 19.Double 78 =
  20. 20.Half of 106 =
  21. 21.Double 31 =
  22. 22.Double 85 =
  23. 23.Half of 192 =
  24. 24.Half of 36 =
  25. 25.Half of 30 =
  26. 26.Half of 88 =
  27. 27.Double 74 =
  28. 28.Double 88 =
  29. 29.Half of 58 =
  30. 30.Double 99 =
  31. 31.Half of 112 =
  32. 32.Double 68 =
  33. 33.Double 38 =
  34. 34.Double 41 =
  35. 35.Half of 196 =
  36. 36.Half of 96 =
  37. 37.Double 93 =
  38. 38.Double 69 =
  39. 39.Double 34 =
  40. 40.Half of 92 =

Answer key

  1. 94
  2. 57
  3. 89
  4. 152
  5. 130
  6. 16
  7. 46
  8. 96
  9. 28
  10. 38
  11. 142
  12. 74
  13. 122
  14. 190
  15. 23
  16. 59
  17. 39
  18. 92
  19. 156
  20. 53
  21. 62
  22. 170
  23. 96
  24. 18
  25. 15
  26. 44
  27. 148
  28. 176
  29. 29
  30. 198
  31. 56
  32. 136
  33. 76
  34. 82
  35. 98
  36. 48
  37. 186
  38. 138
  39. 68
  40. 46

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