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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 767 · 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 66 =
  2. 2.Double 77 =
  3. 3.Double 54 =
  4. 4.Half of 154 =
  5. 5.Double 47 =
  6. 6.Half of 84 =
  7. 7.Double 16 =
  8. 8.Half of 32 =
  9. 9.Half of 48 =
  10. 10.Half of 198 =
  11. 11.Double 93 =
  12. 12.Half of 74 =
  13. 13.Half of 152 =
  14. 14.Double 51 =
  15. 15.Double 31 =
  16. 16.Half of 162 =
  17. 17.Double 43 =
  18. 18.Double 91 =
  19. 19.Half of 90 =
  20. 20.Half of 130 =
  21. 21.Half of 96 =
  22. 22.Double 68 =
  23. 23.Half of 178 =
  24. 24.Double 59 =
  25. 25.Half of 62 =
  26. 26.Half of 146 =
  27. 27.Double 36 =
  28. 28.Double 34 =
  29. 29.Half of 80 =
  30. 30.Double 22 =
  31. 31.Half of 50 =
  32. 32.Half of 172 =
  33. 33.Double 79 =
  34. 34.Double 78 =
  35. 35.Half of 108 =
  36. 36.Double 33 =
  37. 37.Double 35 =
  38. 38.Double 41 =
  39. 39.Double 44 =
  40. 40.Double 21 =

Answer key

  1. 33
  2. 154
  3. 108
  4. 77
  5. 94
  6. 42
  7. 32
  8. 16
  9. 24
  10. 99
  11. 186
  12. 37
  13. 76
  14. 102
  15. 62
  16. 81
  17. 86
  18. 182
  19. 45
  20. 65
  21. 48
  22. 136
  23. 89
  24. 118
  25. 31
  26. 73
  27. 72
  28. 68
  29. 40
  30. 44
  31. 25
  32. 86
  33. 158
  34. 156
  35. 54
  36. 66
  37. 70
  38. 82
  39. 88
  40. 42

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