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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 459 · 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 37 =
  2. 2.Double 33 =
  3. 3.Half of 166 =
  4. 4.Half of 90 =
  5. 5.Half of 106 =
  6. 6.Half of 48 =
  7. 7.Half of 186 =
  8. 8.Half of 44 =
  9. 9.Half of 70 =
  10. 10.Double 35 =
  11. 11.Double 83 =
  12. 12.Double 36 =
  13. 13.Double 97 =
  14. 14.Double 47 =
  15. 15.Half of 140 =
  16. 16.Half of 76 =
  17. 17.Half of 60 =
  18. 18.Half of 134 =
  19. 19.Half of 28 =
  20. 20.Double 75 =
  21. 21.Double 52 =
  22. 22.Half of 50 =
  23. 23.Half of 128 =
  24. 24.Double 59 =
  25. 25.Half of 72 =
  26. 26.Double 26 =
  27. 27.Double 42 =
  28. 28.Double 88 =
  29. 29.Half of 74 =
  30. 30.Half of 168 =
  31. 31.Double 67 =
  32. 32.Double 84 =
  33. 33.Half of 78 =
  34. 34.Half of 196 =
  35. 35.Double 93 =
  36. 36.Half of 54 =
  37. 37.Half of 188 =
  38. 38.Double 82 =
  39. 39.Double 62 =
  40. 40.Double 61 =

Answer key

  1. 74
  2. 66
  3. 83
  4. 45
  5. 53
  6. 24
  7. 93
  8. 22
  9. 35
  10. 70
  11. 166
  12. 72
  13. 194
  14. 94
  15. 70
  16. 38
  17. 30
  18. 67
  19. 14
  20. 150
  21. 104
  22. 25
  23. 64
  24. 118
  25. 36
  26. 52
  27. 84
  28. 176
  29. 37
  30. 84
  31. 134
  32. 168
  33. 39
  34. 98
  35. 186
  36. 27
  37. 94
  38. 164
  39. 124
  40. 122

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