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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 229 · 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.Half of 42 =
  2. 2.Double 46 =
  3. 3.Double 81 =
  4. 4.Half of 172 =
  5. 5.Half of 48 =
  6. 6.Half of 100 =
  7. 7.Double 23 =
  8. 8.Double 59 =
  9. 9.Half of 64 =
  10. 10.Half of 166 =
  11. 11.Double 94 =
  12. 12.Double 51 =
  13. 13.Double 17 =
  14. 14.Half of 72 =
  15. 15.Half of 66 =
  16. 16.Double 93 =
  17. 17.Double 96 =
  18. 18.Double 72 =
  19. 19.Double 57 =
  20. 20.Double 76 =
  21. 21.Half of 84 =
  22. 22.Double 18 =
  23. 23.Half of 34 =
  24. 24.Half of 50 =
  25. 25.Half of 148 =
  26. 26.Half of 96 =
  27. 27.Half of 184 =
  28. 28.Half of 178 =
  29. 29.Double 54 =
  30. 30.Half of 38 =
  31. 31.Half of 26 =
  32. 32.Double 19 =
  33. 33.Double 26 =
  34. 34.Double 55 =
  35. 35.Double 87 =
  36. 36.Double 61 =
  37. 37.Half of 36 =
  38. 38.Half of 194 =
  39. 39.Half of 28 =
  40. 40.Half of 62 =

Answer key

  1. 21
  2. 92
  3. 162
  4. 86
  5. 24
  6. 50
  7. 46
  8. 118
  9. 32
  10. 83
  11. 188
  12. 102
  13. 34
  14. 36
  15. 33
  16. 186
  17. 192
  18. 144
  19. 114
  20. 152
  21. 42
  22. 36
  23. 17
  24. 25
  25. 74
  26. 48
  27. 92
  28. 89
  29. 108
  30. 19
  31. 13
  32. 38
  33. 52
  34. 110
  35. 174
  36. 122
  37. 18
  38. 97
  39. 14
  40. 31

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