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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 95 · 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 62 =
  2. 2.Half of 192 =
  3. 3.Half of 110 =
  4. 4.Double 31 =
  5. 5.Double 24 =
  6. 6.Double 81 =
  7. 7.Half of 116 =
  8. 8.Half of 58 =
  9. 9.Double 62 =
  10. 10.Double 32 =
  11. 11.Double 27 =
  12. 12.Double 45 =
  13. 13.Half of 184 =
  14. 14.Half of 126 =
  15. 15.Half of 82 =
  16. 16.Double 21 =
  17. 17.Half of 180 =
  18. 18.Double 64 =
  19. 19.Half of 186 =
  20. 20.Half of 48 =
  21. 21.Double 16 =
  22. 22.Double 87 =
  23. 23.Half of 168 =
  24. 24.Half of 174 =
  25. 25.Double 93 =
  26. 26.Double 66 =
  27. 27.Double 98 =
  28. 28.Half of 84 =
  29. 29.Double 61 =
  30. 30.Half of 76 =
  31. 31.Half of 146 =
  32. 32.Half of 96 =
  33. 33.Double 89 =
  34. 34.Double 72 =
  35. 35.Double 63 =
  36. 36.Half of 104 =
  37. 37.Half of 128 =
  38. 38.Half of 122 =
  39. 39.Double 46 =
  40. 40.Double 91 =

Answer key

  1. 31
  2. 96
  3. 55
  4. 62
  5. 48
  6. 162
  7. 58
  8. 29
  9. 124
  10. 64
  11. 54
  12. 90
  13. 92
  14. 63
  15. 41
  16. 42
  17. 90
  18. 128
  19. 93
  20. 24
  21. 32
  22. 174
  23. 84
  24. 87
  25. 186
  26. 132
  27. 196
  28. 42
  29. 122
  30. 38
  31. 73
  32. 48
  33. 178
  34. 144
  35. 126
  36. 52
  37. 64
  38. 61
  39. 92
  40. 182

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