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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 267 · 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 28 =
  2. 2.Double 24 =
  3. 3.Double 25 =
  4. 4.Double 56 =
  5. 5.Half of 162 =
  6. 6.Double 59 =
  7. 7.Double 18 =
  8. 8.Half of 64 =
  9. 9.Half of 126 =
  10. 10.Half of 26 =
  11. 11.Double 41 =
  12. 12.Double 84 =
  13. 13.Half of 104 =
  14. 14.Half of 124 =
  15. 15.Double 22 =
  16. 16.Double 81 =
  17. 17.Half of 76 =
  18. 18.Half of 60 =
  19. 19.Double 71 =
  20. 20.Half of 194 =
  21. 21.Double 92 =
  22. 22.Double 42 =
  23. 23.Double 86 =
  24. 24.Double 93 =
  25. 25.Half of 120 =
  26. 26.Double 95 =
  27. 27.Double 83 =
  28. 28.Double 51 =
  29. 29.Double 79 =
  30. 30.Double 94 =
  31. 31.Double 99 =
  32. 32.Double 87 =
  33. 33.Double 27 =
  34. 34.Double 34 =
  35. 35.Half of 118 =
  36. 36.Half of 72 =
  37. 37.Double 58 =
  38. 38.Half of 50 =
  39. 39.Half of 154 =
  40. 40.Half of 168 =

Answer key

  1. 56
  2. 48
  3. 50
  4. 112
  5. 81
  6. 118
  7. 36
  8. 32
  9. 63
  10. 13
  11. 82
  12. 168
  13. 52
  14. 62
  15. 44
  16. 162
  17. 38
  18. 30
  19. 142
  20. 97
  21. 184
  22. 84
  23. 172
  24. 186
  25. 60
  26. 190
  27. 166
  28. 102
  29. 158
  30. 188
  31. 198
  32. 174
  33. 54
  34. 68
  35. 59
  36. 36
  37. 116
  38. 25
  39. 77
  40. 84

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