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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 809 · 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 78 =
  2. 2.Half of 32 =
  3. 3.Half of 62 =
  4. 4.Double 89 =
  5. 5.Half of 184 =
  6. 6.Double 63 =
  7. 7.Half of 86 =
  8. 8.Half of 118 =
  9. 9.Half of 70 =
  10. 10.Half of 78 =
  11. 11.Double 79 =
  12. 12.Double 84 =
  13. 13.Double 87 =
  14. 14.Half of 88 =
  15. 15.Double 42 =
  16. 16.Half of 64 =
  17. 17.Double 19 =
  18. 18.Half of 74 =
  19. 19.Double 68 =
  20. 20.Half of 40 =
  21. 21.Double 31 =
  22. 22.Double 21 =
  23. 23.Half of 156 =
  24. 24.Half of 168 =
  25. 25.Double 27 =
  26. 26.Half of 106 =
  27. 27.Double 73 =
  28. 28.Double 81 =
  29. 29.Half of 132 =
  30. 30.Half of 98 =
  31. 31.Double 41 =
  32. 32.Double 69 =
  33. 33.Half of 52 =
  34. 34.Double 62 =
  35. 35.Half of 134 =
  36. 36.Double 23 =
  37. 37.Half of 76 =
  38. 38.Double 95 =
  39. 39.Double 54 =
  40. 40.Half of 92 =

Answer key

  1. 156
  2. 16
  3. 31
  4. 178
  5. 92
  6. 126
  7. 43
  8. 59
  9. 35
  10. 39
  11. 158
  12. 168
  13. 174
  14. 44
  15. 84
  16. 32
  17. 38
  18. 37
  19. 136
  20. 20
  21. 62
  22. 42
  23. 78
  24. 84
  25. 54
  26. 53
  27. 146
  28. 162
  29. 66
  30. 49
  31. 82
  32. 138
  33. 26
  34. 124
  35. 67
  36. 46
  37. 38
  38. 190
  39. 108
  40. 46

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