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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 325 · 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 154 =
  2. 2.Double 71 =
  3. 3.Half of 78 =
  4. 4.Double 43 =
  5. 5.Half of 34 =
  6. 6.Double 75 =
  7. 7.Half of 50 =
  8. 8.Double 52 =
  9. 9.Half of 160 =
  10. 10.Half of 156 =
  11. 11.Half of 136 =
  12. 12.Half of 54 =
  13. 13.Double 31 =
  14. 14.Double 51 =
  15. 15.Double 78 =
  16. 16.Half of 180 =
  17. 17.Double 94 =
  18. 18.Half of 150 =
  19. 19.Half of 124 =
  20. 20.Double 45 =
  21. 21.Double 77 =
  22. 22.Half of 66 =
  23. 23.Half of 48 =
  24. 24.Double 86 =
  25. 25.Half of 148 =
  26. 26.Double 38 =
  27. 27.Half of 42 =
  28. 28.Double 58 =
  29. 29.Double 74 =
  30. 30.Half of 140 =
  31. 31.Double 48 =
  32. 32.Double 19 =
  33. 33.Half of 164 =
  34. 34.Half of 122 =
  35. 35.Half of 80 =
  36. 36.Half of 152 =
  37. 37.Double 54 =
  38. 38.Double 33 =
  39. 39.Double 88 =
  40. 40.Half of 64 =

Answer key

  1. 77
  2. 142
  3. 39
  4. 86
  5. 17
  6. 150
  7. 25
  8. 104
  9. 80
  10. 78
  11. 68
  12. 27
  13. 62
  14. 102
  15. 156
  16. 90
  17. 188
  18. 75
  19. 62
  20. 90
  21. 154
  22. 33
  23. 24
  24. 172
  25. 74
  26. 76
  27. 21
  28. 116
  29. 148
  30. 70
  31. 96
  32. 38
  33. 82
  34. 61
  35. 40
  36. 76
  37. 108
  38. 66
  39. 176
  40. 32

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