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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 753 · 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 31 =
  2. 2.Half of 104 =
  3. 3.Half of 182 =
  4. 4.Double 19 =
  5. 5.Half of 158 =
  6. 6.Half of 186 =
  7. 7.Half of 60 =
  8. 8.Half of 162 =
  9. 9.Half of 124 =
  10. 10.Double 79 =
  11. 11.Double 73 =
  12. 12.Half of 68 =
  13. 13.Half of 32 =
  14. 14.Half of 178 =
  15. 15.Half of 116 =
  16. 16.Half of 128 =
  17. 17.Half of 72 =
  18. 18.Half of 194 =
  19. 19.Double 51 =
  20. 20.Double 25 =
  21. 21.Half of 62 =
  22. 22.Double 97 =
  23. 23.Half of 44 =
  24. 24.Half of 174 =
  25. 25.Half of 46 =
  26. 26.Double 82 =
  27. 27.Half of 90 =
  28. 28.Half of 42 =
  29. 29.Double 22 =
  30. 30.Double 48 =
  31. 31.Half of 74 =
  32. 32.Double 87 =
  33. 33.Double 68 =
  34. 34.Double 26 =
  35. 35.Half of 58 =
  36. 36.Double 76 =
  37. 37.Half of 154 =
  38. 38.Half of 96 =
  39. 39.Half of 130 =
  40. 40.Double 69 =

Answer key

  1. 62
  2. 52
  3. 91
  4. 38
  5. 79
  6. 93
  7. 30
  8. 81
  9. 62
  10. 158
  11. 146
  12. 34
  13. 16
  14. 89
  15. 58
  16. 64
  17. 36
  18. 97
  19. 102
  20. 50
  21. 31
  22. 194
  23. 22
  24. 87
  25. 23
  26. 164
  27. 45
  28. 21
  29. 44
  30. 96
  31. 37
  32. 174
  33. 136
  34. 52
  35. 29
  36. 152
  37. 77
  38. 48
  39. 65
  40. 138

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