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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 37 · 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 26 =
  2. 2.Half of 166 =
  3. 3.Half of 186 =
  4. 4.Double 82 =
  5. 5.Double 19 =
  6. 6.Half of 74 =
  7. 7.Double 33 =
  8. 8.Double 18 =
  9. 9.Double 53 =
  10. 10.Half of 106 =
  11. 11.Half of 28 =
  12. 12.Double 67 =
  13. 13.Half of 176 =
  14. 14.Half of 50 =
  15. 15.Half of 56 =
  16. 16.Double 35 =
  17. 17.Double 62 =
  18. 18.Half of 158 =
  19. 19.Double 24 =
  20. 20.Half of 192 =
  21. 21.Half of 84 =
  22. 22.Double 89 =
  23. 23.Double 91 =
  24. 24.Double 59 =
  25. 25.Half of 144 =
  26. 26.Half of 190 =
  27. 27.Double 29 =
  28. 28.Half of 168 =
  29. 29.Double 65 =
  30. 30.Double 79 =
  31. 31.Half of 52 =
  32. 32.Half of 96 =
  33. 33.Double 66 =
  34. 34.Double 16 =
  35. 35.Double 34 =
  36. 36.Double 87 =
  37. 37.Double 81 =
  38. 38.Double 27 =
  39. 39.Double 98 =
  40. 40.Half of 68 =

Answer key

  1. 52
  2. 83
  3. 93
  4. 164
  5. 38
  6. 37
  7. 66
  8. 36
  9. 106
  10. 53
  11. 14
  12. 134
  13. 88
  14. 25
  15. 28
  16. 70
  17. 124
  18. 79
  19. 48
  20. 96
  21. 42
  22. 178
  23. 182
  24. 118
  25. 72
  26. 95
  27. 58
  28. 84
  29. 130
  30. 158
  31. 26
  32. 48
  33. 132
  34. 32
  35. 68
  36. 174
  37. 162
  38. 54
  39. 196
  40. 34

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