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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 364 · 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 73 =
  2. 2.Half of 66 =
  3. 3.Half of 70 =
  4. 4.Double 68 =
  5. 5.Half of 134 =
  6. 6.Double 93 =
  7. 7.Half of 168 =
  8. 8.Half of 154 =
  9. 9.Half of 150 =
  10. 10.Half of 146 =
  11. 11.Half of 100 =
  12. 12.Double 53 =
  13. 13.Double 84 =
  14. 14.Double 45 =
  15. 15.Double 41 =
  16. 16.Double 61 =
  17. 17.Double 98 =
  18. 18.Half of 198 =
  19. 19.Double 74 =
  20. 20.Double 69 =
  21. 21.Half of 186 =
  22. 22.Double 49 =
  23. 23.Double 71 =
  24. 24.Half of 164 =
  25. 25.Half of 78 =
  26. 26.Double 59 =
  27. 27.Double 27 =
  28. 28.Double 23 =
  29. 29.Half of 56 =
  30. 30.Double 64 =
  31. 31.Double 37 =
  32. 32.Half of 190 =
  33. 33.Double 35 =
  34. 34.Half of 30 =
  35. 35.Half of 28 =
  36. 36.Half of 188 =
  37. 37.Double 19 =
  38. 38.Double 87 =
  39. 39.Half of 148 =
  40. 40.Double 46 =

Answer key

  1. 146
  2. 33
  3. 35
  4. 136
  5. 67
  6. 186
  7. 84
  8. 77
  9. 75
  10. 73
  11. 50
  12. 106
  13. 168
  14. 90
  15. 82
  16. 122
  17. 196
  18. 99
  19. 148
  20. 138
  21. 93
  22. 98
  23. 142
  24. 82
  25. 39
  26. 118
  27. 54
  28. 46
  29. 28
  30. 128
  31. 74
  32. 95
  33. 70
  34. 15
  35. 14
  36. 94
  37. 38
  38. 174
  39. 74
  40. 92

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