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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 494 · 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 39 =
  2. 2.Double 74 =
  3. 3.Double 82 =
  4. 4.Half of 60 =
  5. 5.Half of 164 =
  6. 6.Half of 110 =
  7. 7.Double 99 =
  8. 8.Double 73 =
  9. 9.Double 71 =
  10. 10.Half of 70 =
  11. 11.Double 97 =
  12. 12.Half of 174 =
  13. 13.Half of 198 =
  14. 14.Double 78 =
  15. 15.Half of 196 =
  16. 16.Half of 152 =
  17. 17.Double 84 =
  18. 18.Half of 54 =
  19. 19.Half of 114 =
  20. 20.Half of 100 =
  21. 21.Double 54 =
  22. 22.Half of 26 =
  23. 23.Double 37 =
  24. 24.Double 93 =
  25. 25.Half of 46 =
  26. 26.Half of 178 =
  27. 27.Double 19 =
  28. 28.Double 98 =
  29. 29.Double 23 =
  30. 30.Double 61 =
  31. 31.Double 32 =
  32. 32.Half of 38 =
  33. 33.Double 25 =
  34. 34.Double 55 =
  35. 35.Double 18 =
  36. 36.Half of 30 =
  37. 37.Half of 62 =
  38. 38.Half of 58 =
  39. 39.Half of 122 =
  40. 40.Double 31 =

Answer key

  1. 78
  2. 148
  3. 164
  4. 30
  5. 82
  6. 55
  7. 198
  8. 146
  9. 142
  10. 35
  11. 194
  12. 87
  13. 99
  14. 156
  15. 98
  16. 76
  17. 168
  18. 27
  19. 57
  20. 50
  21. 108
  22. 13
  23. 74
  24. 186
  25. 23
  26. 89
  27. 38
  28. 196
  29. 46
  30. 122
  31. 64
  32. 19
  33. 50
  34. 110
  35. 36
  36. 15
  37. 31
  38. 29
  39. 61
  40. 62

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