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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 555 · 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 79 =
  2. 2.Half of 152 =
  3. 3.Half of 60 =
  4. 4.Half of 124 =
  5. 5.Half of 160 =
  6. 6.Half of 104 =
  7. 7.Double 48 =
  8. 8.Double 53 =
  9. 9.Half of 180 =
  10. 10.Double 61 =
  11. 11.Double 66 =
  12. 12.Double 31 =
  13. 13.Double 42 =
  14. 14.Double 51 =
  15. 15.Double 23 =
  16. 16.Double 67 =
  17. 17.Double 45 =
  18. 18.Half of 122 =
  19. 19.Double 91 =
  20. 20.Half of 184 =
  21. 21.Double 82 =
  22. 22.Half of 48 =
  23. 23.Double 47 =
  24. 24.Half of 102 =
  25. 25.Half of 62 =
  26. 26.Half of 188 =
  27. 27.Half of 178 =
  28. 28.Double 41 =
  29. 29.Half of 120 =
  30. 30.Half of 190 =
  31. 31.Double 65 =
  32. 32.Half of 72 =
  33. 33.Double 81 =
  34. 34.Double 62 =
  35. 35.Half of 40 =
  36. 36.Double 71 =
  37. 37.Double 78 =
  38. 38.Double 64 =
  39. 39.Half of 114 =
  40. 40.Double 63 =

Answer key

  1. 158
  2. 76
  3. 30
  4. 62
  5. 80
  6. 52
  7. 96
  8. 106
  9. 90
  10. 122
  11. 132
  12. 62
  13. 84
  14. 102
  15. 46
  16. 134
  17. 90
  18. 61
  19. 182
  20. 92
  21. 164
  22. 24
  23. 94
  24. 51
  25. 31
  26. 94
  27. 89
  28. 82
  29. 60
  30. 95
  31. 130
  32. 36
  33. 162
  34. 124
  35. 20
  36. 142
  37. 156
  38. 128
  39. 57
  40. 126

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