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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 691 · 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.Double 29 =
  3. 3.Half of 138 =
  4. 4.Double 86 =
  5. 5.Double 67 =
  6. 6.Double 79 =
  7. 7.Double 93 =
  8. 8.Double 72 =
  9. 9.Double 61 =
  10. 10.Double 37 =
  11. 11.Half of 178 =
  12. 12.Double 56 =
  13. 13.Half of 198 =
  14. 14.Double 28 =
  15. 15.Double 21 =
  16. 16.Double 16 =
  17. 17.Double 82 =
  18. 18.Half of 152 =
  19. 19.Double 41 =
  20. 20.Double 47 =
  21. 21.Double 73 =
  22. 22.Double 35 =
  23. 23.Half of 196 =
  24. 24.Half of 44 =
  25. 25.Half of 42 =
  26. 26.Double 85 =
  27. 27.Half of 36 =
  28. 28.Double 51 =
  29. 29.Double 26 =
  30. 30.Half of 114 =
  31. 31.Half of 158 =
  32. 32.Half of 60 =
  33. 33.Double 39 =
  34. 34.Double 87 =
  35. 35.Double 68 =
  36. 36.Half of 136 =
  37. 37.Half of 38 =
  38. 38.Double 98 =
  39. 39.Double 65 =
  40. 40.Half of 106 =

Answer key

  1. 62
  2. 58
  3. 69
  4. 172
  5. 134
  6. 158
  7. 186
  8. 144
  9. 122
  10. 74
  11. 89
  12. 112
  13. 99
  14. 56
  15. 42
  16. 32
  17. 164
  18. 76
  19. 82
  20. 94
  21. 146
  22. 70
  23. 98
  24. 22
  25. 21
  26. 170
  27. 18
  28. 102
  29. 52
  30. 57
  31. 79
  32. 30
  33. 78
  34. 174
  35. 136
  36. 68
  37. 19
  38. 196
  39. 130
  40. 53

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