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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 454 · 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 49 =
  2. 2.Half of 172 =
  3. 3.Half of 100 =
  4. 4.Half of 146 =
  5. 5.Double 91 =
  6. 6.Double 76 =
  7. 7.Double 62 =
  8. 8.Half of 96 =
  9. 9.Double 27 =
  10. 10.Double 41 =
  11. 11.Half of 48 =
  12. 12.Double 56 =
  13. 13.Half of 82 =
  14. 14.Double 29 =
  15. 15.Half of 84 =
  16. 16.Half of 132 =
  17. 17.Double 16 =
  18. 18.Double 97 =
  19. 19.Half of 152 =
  20. 20.Double 81 =
  21. 21.Double 68 =
  22. 22.Double 75 =
  23. 23.Double 71 =
  24. 24.Half of 62 =
  25. 25.Double 74 =
  26. 26.Half of 50 =
  27. 27.Half of 116 =
  28. 28.Double 64 =
  29. 29.Half of 88 =
  30. 30.Double 17 =
  31. 31.Double 95 =
  32. 32.Half of 26 =
  33. 33.Double 78 =
  34. 34.Double 42 =
  35. 35.Half of 148 =
  36. 36.Half of 184 =
  37. 37.Half of 34 =
  38. 38.Double 35 =
  39. 39.Double 61 =
  40. 40.Double 33 =

Answer key

  1. 98
  2. 86
  3. 50
  4. 73
  5. 182
  6. 152
  7. 124
  8. 48
  9. 54
  10. 82
  11. 24
  12. 112
  13. 41
  14. 58
  15. 42
  16. 66
  17. 32
  18. 194
  19. 76
  20. 162
  21. 136
  22. 150
  23. 142
  24. 31
  25. 148
  26. 25
  27. 58
  28. 128
  29. 44
  30. 34
  31. 190
  32. 13
  33. 156
  34. 84
  35. 74
  36. 92
  37. 17
  38. 70
  39. 122
  40. 66

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