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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 142 · 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 90 =
  2. 2.Half of 110 =
  3. 3.Half of 54 =
  4. 4.Double 48 =
  5. 5.Half of 34 =
  6. 6.Half of 42 =
  7. 7.Half of 50 =
  8. 8.Double 42 =
  9. 9.Double 91 =
  10. 10.Double 18 =
  11. 11.Double 51 =
  12. 12.Half of 132 =
  13. 13.Half of 184 =
  14. 14.Half of 64 =
  15. 15.Half of 154 =
  16. 16.Half of 100 =
  17. 17.Double 92 =
  18. 18.Half of 166 =
  19. 19.Double 27 =
  20. 20.Double 31 =
  21. 21.Double 81 =
  22. 22.Double 32 =
  23. 23.Half of 114 =
  24. 24.Double 37 =
  25. 25.Half of 74 =
  26. 26.Half of 144 =
  27. 27.Half of 190 =
  28. 28.Double 98 =
  29. 29.Half of 76 =
  30. 30.Half of 60 =
  31. 31.Double 16 =
  32. 32.Half of 198 =
  33. 33.Double 71 =
  34. 34.Half of 46 =
  35. 35.Half of 68 =
  36. 36.Half of 164 =
  37. 37.Half of 70 =
  38. 38.Double 68 =
  39. 39.Double 62 =
  40. 40.Half of 182 =

Answer key

  1. 45
  2. 55
  3. 27
  4. 96
  5. 17
  6. 21
  7. 25
  8. 84
  9. 182
  10. 36
  11. 102
  12. 66
  13. 92
  14. 32
  15. 77
  16. 50
  17. 184
  18. 83
  19. 54
  20. 62
  21. 162
  22. 64
  23. 57
  24. 74
  25. 37
  26. 72
  27. 95
  28. 196
  29. 38
  30. 30
  31. 32
  32. 99
  33. 142
  34. 23
  35. 34
  36. 82
  37. 35
  38. 136
  39. 124
  40. 91

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