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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 89 · 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 75 =
  2. 2.Double 89 =
  3. 3.Double 73 =
  4. 4.Double 35 =
  5. 5.Double 53 =
  6. 6.Double 34 =
  7. 7.Double 43 =
  8. 8.Half of 194 =
  9. 9.Half of 188 =
  10. 10.Double 36 =
  11. 11.Half of 132 =
  12. 12.Double 81 =
  13. 13.Half of 74 =
  14. 14.Half of 150 =
  15. 15.Double 61 =
  16. 16.Half of 186 =
  17. 17.Half of 142 =
  18. 18.Double 57 =
  19. 19.Half of 62 =
  20. 20.Half of 84 =
  21. 21.Double 95 =
  22. 22.Half of 120 =
  23. 23.Double 87 =
  24. 24.Double 39 =
  25. 25.Double 59 =
  26. 26.Double 71 =
  27. 27.Double 65 =
  28. 28.Double 67 =
  29. 29.Half of 38 =
  30. 30.Double 63 =
  31. 31.Half of 80 =
  32. 32.Half of 58 =
  33. 33.Half of 90 =
  34. 34.Half of 30 =
  35. 35.Half of 192 =
  36. 36.Half of 92 =
  37. 37.Double 51 =
  38. 38.Double 93 =
  39. 39.Double 27 =
  40. 40.Half of 78 =

Answer key

  1. 150
  2. 178
  3. 146
  4. 70
  5. 106
  6. 68
  7. 86
  8. 97
  9. 94
  10. 72
  11. 66
  12. 162
  13. 37
  14. 75
  15. 122
  16. 93
  17. 71
  18. 114
  19. 31
  20. 42
  21. 190
  22. 60
  23. 174
  24. 78
  25. 118
  26. 142
  27. 130
  28. 134
  29. 19
  30. 126
  31. 40
  32. 29
  33. 45
  34. 15
  35. 96
  36. 46
  37. 102
  38. 186
  39. 54
  40. 39

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