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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 488 · 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 114 =
  2. 2.Half of 88 =
  3. 3.Double 57 =
  4. 4.Half of 76 =
  5. 5.Half of 154 =
  6. 6.Half of 38 =
  7. 7.Half of 50 =
  8. 8.Double 91 =
  9. 9.Double 54 =
  10. 10.Double 24 =
  11. 11.Half of 158 =
  12. 12.Double 16 =
  13. 13.Half of 58 =
  14. 14.Half of 40 =
  15. 15.Double 51 =
  16. 16.Double 96 =
  17. 17.Double 27 =
  18. 18.Half of 170 =
  19. 19.Double 75 =
  20. 20.Half of 148 =
  21. 21.Double 65 =
  22. 22.Double 71 =
  23. 23.Half of 46 =
  24. 24.Double 19 =
  25. 25.Half of 124 =
  26. 26.Double 82 =
  27. 27.Double 23 =
  28. 28.Half of 104 =
  29. 29.Half of 44 =
  30. 30.Half of 48 =
  31. 31.Double 86 =
  32. 32.Half of 182 =
  33. 33.Half of 112 =
  34. 34.Half of 68 =
  35. 35.Double 46 =
  36. 36.Double 84 =
  37. 37.Half of 106 =
  38. 38.Double 47 =
  39. 39.Half of 136 =
  40. 40.Double 42 =

Answer key

  1. 57
  2. 44
  3. 114
  4. 38
  5. 77
  6. 19
  7. 25
  8. 182
  9. 108
  10. 48
  11. 79
  12. 32
  13. 29
  14. 20
  15. 102
  16. 192
  17. 54
  18. 85
  19. 150
  20. 74
  21. 130
  22. 142
  23. 23
  24. 38
  25. 62
  26. 164
  27. 46
  28. 52
  29. 22
  30. 24
  31. 172
  32. 91
  33. 56
  34. 34
  35. 92
  36. 168
  37. 53
  38. 94
  39. 68
  40. 84

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