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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 236 · 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 106 =
  2. 2.Double 62 =
  3. 3.Double 58 =
  4. 4.Half of 76 =
  5. 5.Half of 86 =
  6. 6.Double 75 =
  7. 7.Double 67 =
  8. 8.Double 85 =
  9. 9.Double 53 =
  10. 10.Double 34 =
  11. 11.Half of 50 =
  12. 12.Double 31 =
  13. 13.Double 54 =
  14. 14.Double 86 =
  15. 15.Double 27 =
  16. 16.Double 41 =
  17. 17.Half of 96 =
  18. 18.Half of 32 =
  19. 19.Half of 116 =
  20. 20.Half of 42 =
  21. 21.Double 73 =
  22. 22.Half of 58 =
  23. 23.Double 83 =
  24. 24.Double 43 =
  25. 25.Double 59 =
  26. 26.Half of 186 =
  27. 27.Double 35 =
  28. 28.Half of 30 =
  29. 29.Double 38 =
  30. 30.Double 46 =
  31. 31.Half of 166 =
  32. 32.Double 74 =
  33. 33.Double 21 =
  34. 34.Half of 156 =
  35. 35.Half of 108 =
  36. 36.Double 18 =
  37. 37.Half of 154 =
  38. 38.Half of 102 =
  39. 39.Double 95 =
  40. 40.Double 77 =

Answer key

  1. 53
  2. 124
  3. 116
  4. 38
  5. 43
  6. 150
  7. 134
  8. 170
  9. 106
  10. 68
  11. 25
  12. 62
  13. 108
  14. 172
  15. 54
  16. 82
  17. 48
  18. 16
  19. 58
  20. 21
  21. 146
  22. 29
  23. 166
  24. 86
  25. 118
  26. 93
  27. 70
  28. 15
  29. 76
  30. 92
  31. 83
  32. 148
  33. 42
  34. 78
  35. 54
  36. 36
  37. 77
  38. 51
  39. 190
  40. 154

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