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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 782 · 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 192 =
  2. 2.Half of 76 =
  3. 3.Half of 118 =
  4. 4.Double 78 =
  5. 5.Double 32 =
  6. 6.Half of 128 =
  7. 7.Half of 114 =
  8. 8.Half of 148 =
  9. 9.Half of 64 =
  10. 10.Half of 182 =
  11. 11.Half of 98 =
  12. 12.Double 92 =
  13. 13.Double 17 =
  14. 14.Half of 36 =
  15. 15.Double 29 =
  16. 16.Double 23 =
  17. 17.Half of 168 =
  18. 18.Double 49 =
  19. 19.Double 56 =
  20. 20.Half of 92 =
  21. 21.Half of 68 =
  22. 22.Half of 146 =
  23. 23.Double 54 =
  24. 24.Double 26 =
  25. 25.Double 22 =
  26. 26.Double 39 =
  27. 27.Double 51 =
  28. 28.Double 28 =
  29. 29.Double 52 =
  30. 30.Double 87 =
  31. 31.Double 57 =
  32. 32.Half of 100 =
  33. 33.Double 59 =
  34. 34.Half of 172 =
  35. 35.Half of 164 =
  36. 36.Double 44 =
  37. 37.Half of 58 =
  38. 38.Double 65 =
  39. 39.Half of 46 =
  40. 40.Half of 156 =

Answer key

  1. 96
  2. 38
  3. 59
  4. 156
  5. 64
  6. 64
  7. 57
  8. 74
  9. 32
  10. 91
  11. 49
  12. 184
  13. 34
  14. 18
  15. 58
  16. 46
  17. 84
  18. 98
  19. 112
  20. 46
  21. 34
  22. 73
  23. 108
  24. 52
  25. 44
  26. 78
  27. 102
  28. 56
  29. 104
  30. 174
  31. 114
  32. 50
  33. 118
  34. 86
  35. 82
  36. 88
  37. 29
  38. 130
  39. 23
  40. 78

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