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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 148 · 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 39 =
  2. 2.Half of 84 =
  3. 3.Half of 174 =
  4. 4.Half of 64 =
  5. 5.Double 32 =
  6. 6.Double 38 =
  7. 7.Half of 118 =
  8. 8.Double 91 =
  9. 9.Half of 178 =
  10. 10.Double 62 =
  11. 11.Half of 106 =
  12. 12.Half of 92 =
  13. 13.Half of 38 =
  14. 14.Double 94 =
  15. 15.Double 51 =
  16. 16.Half of 176 =
  17. 17.Half of 124 =
  18. 18.Double 44 =
  19. 19.Double 96 =
  20. 20.Double 24 =
  21. 21.Double 59 =
  22. 22.Double 41 =
  23. 23.Half of 48 =
  24. 24.Half of 158 =
  25. 25.Half of 30 =
  26. 26.Half of 52 =
  27. 27.Double 26 =
  28. 28.Half of 152 =
  29. 29.Half of 110 =
  30. 30.Half of 116 =
  31. 31.Half of 54 =
  32. 32.Half of 164 =
  33. 33.Half of 156 =
  34. 34.Double 81 =
  35. 35.Half of 58 =
  36. 36.Double 17 =
  37. 37.Half of 194 =
  38. 38.Double 35 =
  39. 39.Half of 42 =
  40. 40.Half of 74 =

Answer key

  1. 78
  2. 42
  3. 87
  4. 32
  5. 64
  6. 76
  7. 59
  8. 182
  9. 89
  10. 124
  11. 53
  12. 46
  13. 19
  14. 188
  15. 102
  16. 88
  17. 62
  18. 88
  19. 192
  20. 48
  21. 118
  22. 82
  23. 24
  24. 79
  25. 15
  26. 26
  27. 52
  28. 76
  29. 55
  30. 58
  31. 27
  32. 82
  33. 78
  34. 162
  35. 29
  36. 34
  37. 97
  38. 70
  39. 21
  40. 37

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