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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 444 · 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 39 =
  2. 2.Half of 86 =
  3. 3.Half of 82 =
  4. 4.Double 93 =
  5. 5.Double 88 =
  6. 6.Half of 58 =
  7. 7.Half of 194 =
  8. 8.Half of 108 =
  9. 9.Half of 156 =
  10. 10.Double 19 =
  11. 11.Half of 170 =
  12. 12.Double 66 =
  13. 13.Half of 100 =
  14. 14.Half of 54 =
  15. 15.Double 52 =
  16. 16.Half of 136 =
  17. 17.Double 67 =
  18. 18.Double 16 =
  19. 19.Half of 78 =
  20. 20.Half of 48 =
  21. 21.Double 47 =
  22. 22.Half of 144 =
  23. 23.Half of 116 =
  24. 24.Half of 128 =
  25. 25.Half of 64 =
  26. 26.Double 36 =
  27. 27.Half of 154 =
  28. 28.Double 71 =
  29. 29.Double 73 =
  30. 30.Half of 70 =
  31. 31.Half of 60 =
  32. 32.Half of 38 =
  33. 33.Double 37 =
  34. 34.Half of 190 =
  35. 35.Half of 114 =
  36. 36.Half of 88 =
  37. 37.Double 87 =
  38. 38.Double 17 =
  39. 39.Half of 150 =
  40. 40.Half of 92 =

Answer key

  1. 78
  2. 43
  3. 41
  4. 186
  5. 176
  6. 29
  7. 97
  8. 54
  9. 78
  10. 38
  11. 85
  12. 132
  13. 50
  14. 27
  15. 104
  16. 68
  17. 134
  18. 32
  19. 39
  20. 24
  21. 94
  22. 72
  23. 58
  24. 64
  25. 32
  26. 72
  27. 77
  28. 142
  29. 146
  30. 35
  31. 30
  32. 19
  33. 74
  34. 95
  35. 57
  36. 44
  37. 174
  38. 34
  39. 75
  40. 46

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