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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 164 · 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 17 =
  2. 2.Half of 66 =
  3. 3.Half of 30 =
  4. 4.Double 19 =
  5. 5.Half of 108 =
  6. 6.Half of 28 =
  7. 7.Half of 42 =
  8. 8.Half of 106 =
  9. 9.Half of 176 =
  10. 10.Double 82 =
  11. 11.Half of 144 =
  12. 12.Double 73 =
  13. 13.Double 53 =
  14. 14.Half of 126 =
  15. 15.Double 25 =
  16. 16.Double 34 =
  17. 17.Half of 100 =
  18. 18.Double 81 =
  19. 19.Double 21 =
  20. 20.Double 16 =
  21. 21.Half of 78 =
  22. 22.Double 94 =
  23. 23.Double 95 =
  24. 24.Double 74 =
  25. 25.Half of 44 =
  26. 26.Double 48 =
  27. 27.Half of 84 =
  28. 28.Double 91 =
  29. 29.Half of 58 =
  30. 30.Half of 48 =
  31. 31.Half of 64 =
  32. 32.Half of 56 =
  33. 33.Double 37 =
  34. 34.Double 79 =
  35. 35.Half of 60 =
  36. 36.Double 62 =
  37. 37.Half of 88 =
  38. 38.Double 31 =
  39. 39.Double 86 =
  40. 40.Double 88 =

Answer key

  1. 34
  2. 33
  3. 15
  4. 38
  5. 54
  6. 14
  7. 21
  8. 53
  9. 88
  10. 164
  11. 72
  12. 146
  13. 106
  14. 63
  15. 50
  16. 68
  17. 50
  18. 162
  19. 42
  20. 32
  21. 39
  22. 188
  23. 190
  24. 148
  25. 22
  26. 96
  27. 42
  28. 182
  29. 29
  30. 24
  31. 32
  32. 28
  33. 74
  34. 158
  35. 30
  36. 124
  37. 44
  38. 62
  39. 172
  40. 176

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