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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 76 · 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 84 =
  2. 2.Double 69 =
  3. 3.Half of 62 =
  4. 4.Double 92 =
  5. 5.Double 25 =
  6. 6.Double 89 =
  7. 7.Half of 68 =
  8. 8.Half of 74 =
  9. 9.Double 85 =
  10. 10.Double 31 =
  11. 11.Double 38 =
  12. 12.Half of 86 =
  13. 13.Double 59 =
  14. 14.Half of 146 =
  15. 15.Double 78 =
  16. 16.Half of 30 =
  17. 17.Half of 182 =
  18. 18.Double 88 =
  19. 19.Half of 98 =
  20. 20.Double 32 =
  21. 21.Half of 50 =
  22. 22.Double 75 =
  23. 23.Double 93 =
  24. 24.Half of 186 =
  25. 25.Double 27 =
  26. 26.Half of 132 =
  27. 27.Half of 82 =
  28. 28.Double 99 =
  29. 29.Double 37 =
  30. 30.Half of 134 =
  31. 31.Half of 42 =
  32. 32.Double 82 =
  33. 33.Half of 52 =
  34. 34.Double 77 =
  35. 35.Double 76 =
  36. 36.Half of 26 =
  37. 37.Half of 84 =
  38. 38.Half of 122 =
  39. 39.Double 18 =
  40. 40.Half of 160 =

Answer key

  1. 168
  2. 138
  3. 31
  4. 184
  5. 50
  6. 178
  7. 34
  8. 37
  9. 170
  10. 62
  11. 76
  12. 43
  13. 118
  14. 73
  15. 156
  16. 15
  17. 91
  18. 176
  19. 49
  20. 64
  21. 25
  22. 150
  23. 186
  24. 93
  25. 54
  26. 66
  27. 41
  28. 198
  29. 74
  30. 67
  31. 21
  32. 164
  33. 26
  34. 154
  35. 152
  36. 13
  37. 42
  38. 61
  39. 36
  40. 80

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