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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 833 · 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 154 =
  2. 2.Half of 62 =
  3. 3.Half of 76 =
  4. 4.Half of 136 =
  5. 5.Half of 80 =
  6. 6.Half of 42 =
  7. 7.Double 46 =
  8. 8.Double 75 =
  9. 9.Half of 134 =
  10. 10.Double 31 =
  11. 11.Half of 122 =
  12. 12.Half of 126 =
  13. 13.Double 36 =
  14. 14.Half of 178 =
  15. 15.Half of 30 =
  16. 16.Half of 140 =
  17. 17.Double 23 =
  18. 18.Double 67 =
  19. 19.Half of 144 =
  20. 20.Double 57 =
  21. 21.Half of 26 =
  22. 22.Double 32 =
  23. 23.Double 76 =
  24. 24.Half of 124 =
  25. 25.Double 64 =
  26. 26.Half of 74 =
  27. 27.Half of 44 =
  28. 28.Double 59 =
  29. 29.Double 33 =
  30. 30.Half of 54 =
  31. 31.Double 61 =
  32. 32.Double 24 =
  33. 33.Half of 152 =
  34. 34.Double 56 =
  35. 35.Half of 52 =
  36. 36.Half of 28 =
  37. 37.Double 21 =
  38. 38.Double 34 =
  39. 39.Double 91 =
  40. 40.Double 86 =

Answer key

  1. 77
  2. 31
  3. 38
  4. 68
  5. 40
  6. 21
  7. 92
  8. 150
  9. 67
  10. 62
  11. 61
  12. 63
  13. 72
  14. 89
  15. 15
  16. 70
  17. 46
  18. 134
  19. 72
  20. 114
  21. 13
  22. 64
  23. 152
  24. 62
  25. 128
  26. 37
  27. 22
  28. 118
  29. 66
  30. 27
  31. 122
  32. 48
  33. 76
  34. 112
  35. 26
  36. 14
  37. 42
  38. 68
  39. 182
  40. 172

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