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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 561 · 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 168 =
  2. 2.Half of 80 =
  3. 3.Double 37 =
  4. 4.Double 39 =
  5. 5.Half of 108 =
  6. 6.Double 44 =
  7. 7.Half of 128 =
  8. 8.Double 69 =
  9. 9.Half of 122 =
  10. 10.Half of 64 =
  11. 11.Double 29 =
  12. 12.Double 55 =
  13. 13.Half of 120 =
  14. 14.Half of 190 =
  15. 15.Half of 104 =
  16. 16.Double 45 =
  17. 17.Double 85 =
  18. 18.Half of 106 =
  19. 19.Half of 152 =
  20. 20.Half of 66 =
  21. 21.Half of 90 =
  22. 22.Double 96 =
  23. 23.Double 36 =
  24. 24.Double 74 =
  25. 25.Half of 38 =
  26. 26.Double 68 =
  27. 27.Double 51 =
  28. 28.Double 22 =
  29. 29.Half of 76 =
  30. 30.Half of 124 =
  31. 31.Double 77 =
  32. 32.Half of 196 =
  33. 33.Double 78 =
  34. 34.Half of 146 =
  35. 35.Double 46 =
  36. 36.Double 49 =
  37. 37.Half of 170 =
  38. 38.Double 35 =
  39. 39.Half of 98 =
  40. 40.Half of 32 =

Answer key

  1. 84
  2. 40
  3. 74
  4. 78
  5. 54
  6. 88
  7. 64
  8. 138
  9. 61
  10. 32
  11. 58
  12. 110
  13. 60
  14. 95
  15. 52
  16. 90
  17. 170
  18. 53
  19. 76
  20. 33
  21. 45
  22. 192
  23. 72
  24. 148
  25. 19
  26. 136
  27. 102
  28. 44
  29. 38
  30. 62
  31. 154
  32. 98
  33. 156
  34. 73
  35. 92
  36. 98
  37. 85
  38. 70
  39. 49
  40. 16

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