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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 32 · 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 66 =
  2. 2.Double 59 =
  3. 3.Double 65 =
  4. 4.Double 51 =
  5. 5.Double 94 =
  6. 6.Half of 80 =
  7. 7.Half of 100 =
  8. 8.Half of 66 =
  9. 9.Double 32 =
  10. 10.Half of 54 =
  11. 11.Half of 124 =
  12. 12.Half of 128 =
  13. 13.Half of 36 =
  14. 14.Half of 166 =
  15. 15.Double 79 =
  16. 16.Half of 78 =
  17. 17.Half of 156 =
  18. 18.Half of 134 =
  19. 19.Half of 96 =
  20. 20.Double 54 =
  21. 21.Half of 50 =
  22. 22.Double 62 =
  23. 23.Half of 118 =
  24. 24.Double 76 =
  25. 25.Half of 188 =
  26. 26.Half of 60 =
  27. 27.Half of 178 =
  28. 28.Double 71 =
  29. 29.Half of 48 =
  30. 30.Half of 30 =
  31. 31.Half of 110 =
  32. 32.Half of 104 =
  33. 33.Double 83 =
  34. 34.Half of 38 =
  35. 35.Half of 32 =
  36. 36.Half of 40 =
  37. 37.Half of 190 =
  38. 38.Double 47 =
  39. 39.Half of 86 =
  40. 40.Half of 64 =

Answer key

  1. 132
  2. 118
  3. 130
  4. 102
  5. 188
  6. 40
  7. 50
  8. 33
  9. 64
  10. 27
  11. 62
  12. 64
  13. 18
  14. 83
  15. 158
  16. 39
  17. 78
  18. 67
  19. 48
  20. 108
  21. 25
  22. 124
  23. 59
  24. 152
  25. 94
  26. 30
  27. 89
  28. 142
  29. 24
  30. 15
  31. 55
  32. 52
  33. 166
  34. 19
  35. 16
  36. 20
  37. 95
  38. 94
  39. 43
  40. 32

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