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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 412 · 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 41 =
  2. 2.Double 85 =
  3. 3.Half of 60 =
  4. 4.Double 37 =
  5. 5.Half of 74 =
  6. 6.Double 78 =
  7. 7.Half of 54 =
  8. 8.Half of 98 =
  9. 9.Half of 140 =
  10. 10.Half of 44 =
  11. 11.Double 55 =
  12. 12.Half of 168 =
  13. 13.Half of 86 =
  14. 14.Double 49 =
  15. 15.Half of 36 =
  16. 16.Double 16 =
  17. 17.Double 72 =
  18. 18.Half of 138 =
  19. 19.Double 17 =
  20. 20.Half of 70 =
  21. 21.Double 19 =
  22. 22.Half of 108 =
  23. 23.Double 88 =
  24. 24.Half of 132 =
  25. 25.Half of 186 =
  26. 26.Half of 64 =
  27. 27.Double 21 =
  28. 28.Double 92 =
  29. 29.Double 98 =
  30. 30.Half of 136 =
  31. 31.Double 63 =
  32. 32.Double 28 =
  33. 33.Double 76 =
  34. 34.Double 71 =
  35. 35.Double 67 =
  36. 36.Double 69 =
  37. 37.Double 36 =
  38. 38.Half of 134 =
  39. 39.Double 68 =
  40. 40.Double 38 =

Answer key

  1. 82
  2. 170
  3. 30
  4. 74
  5. 37
  6. 156
  7. 27
  8. 49
  9. 70
  10. 22
  11. 110
  12. 84
  13. 43
  14. 98
  15. 18
  16. 32
  17. 144
  18. 69
  19. 34
  20. 35
  21. 38
  22. 54
  23. 176
  24. 66
  25. 93
  26. 32
  27. 42
  28. 184
  29. 196
  30. 68
  31. 126
  32. 56
  33. 152
  34. 142
  35. 134
  36. 138
  37. 72
  38. 67
  39. 136
  40. 76

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