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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 75 · 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 56 =
  2. 2.Double 64 =
  3. 3.Double 63 =
  4. 4.Double 41 =
  5. 5.Double 96 =
  6. 6.Half of 182 =
  7. 7.Double 18 =
  8. 8.Half of 30 =
  9. 9.Half of 40 =
  10. 10.Half of 150 =
  11. 11.Double 68 =
  12. 12.Double 82 =
  13. 13.Double 91 =
  14. 14.Half of 58 =
  15. 15.Double 61 =
  16. 16.Half of 76 =
  17. 17.Half of 64 =
  18. 18.Half of 50 =
  19. 19.Half of 188 =
  20. 20.Double 79 =
  21. 21.Half of 38 =
  22. 22.Double 71 =
  23. 23.Double 19 =
  24. 24.Double 49 =
  25. 25.Half of 138 =
  26. 26.Double 74 =
  27. 27.Double 93 =
  28. 28.Double 37 =
  29. 29.Half of 46 =
  30. 30.Half of 142 =
  31. 31.Double 16 =
  32. 32.Half of 160 =
  33. 33.Double 44 =
  34. 34.Half of 62 =
  35. 35.Double 27 =
  36. 36.Double 58 =
  37. 37.Half of 120 =
  38. 38.Half of 164 =
  39. 39.Double 21 =
  40. 40.Double 54 =

Answer key

  1. 112
  2. 128
  3. 126
  4. 82
  5. 192
  6. 91
  7. 36
  8. 15
  9. 20
  10. 75
  11. 136
  12. 164
  13. 182
  14. 29
  15. 122
  16. 38
  17. 32
  18. 25
  19. 94
  20. 158
  21. 19
  22. 142
  23. 38
  24. 98
  25. 69
  26. 148
  27. 186
  28. 74
  29. 23
  30. 71
  31. 32
  32. 80
  33. 88
  34. 31
  35. 54
  36. 116
  37. 60
  38. 82
  39. 42
  40. 108

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