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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 64 · 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 124 =
  2. 2.Double 87 =
  3. 3.Half of 174 =
  4. 4.Double 97 =
  5. 5.Half of 142 =
  6. 6.Half of 186 =
  7. 7.Double 71 =
  8. 8.Half of 182 =
  9. 9.Half of 92 =
  10. 10.Double 84 =
  11. 11.Half of 76 =
  12. 12.Double 17 =
  13. 13.Double 78 =
  14. 14.Double 94 =
  15. 15.Half of 66 =
  16. 16.Double 85 =
  17. 17.Half of 88 =
  18. 18.Double 37 =
  19. 19.Half of 38 =
  20. 20.Half of 172 =
  21. 21.Double 66 =
  22. 22.Half of 164 =
  23. 23.Double 89 =
  24. 24.Double 21 =
  25. 25.Half of 136 =
  26. 26.Double 74 =
  27. 27.Half of 70 =
  28. 28.Double 61 =
  29. 29.Double 53 =
  30. 30.Half of 58 =
  31. 31.Double 51 =
  32. 32.Double 54 =
  33. 33.Double 88 =
  34. 34.Double 56 =
  35. 35.Double 16 =
  36. 36.Double 23 =
  37. 37.Half of 32 =
  38. 38.Double 86 =
  39. 39.Half of 80 =
  40. 40.Half of 110 =

Answer key

  1. 62
  2. 174
  3. 87
  4. 194
  5. 71
  6. 93
  7. 142
  8. 91
  9. 46
  10. 168
  11. 38
  12. 34
  13. 156
  14. 188
  15. 33
  16. 170
  17. 44
  18. 74
  19. 19
  20. 86
  21. 132
  22. 82
  23. 178
  24. 42
  25. 68
  26. 148
  27. 35
  28. 122
  29. 106
  30. 29
  31. 102
  32. 108
  33. 176
  34. 112
  35. 32
  36. 46
  37. 16
  38. 172
  39. 40
  40. 55

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