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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 292 · 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 160 =
  2. 2.Double 41 =
  3. 3.Double 47 =
  4. 4.Half of 56 =
  5. 5.Double 31 =
  6. 6.Half of 102 =
  7. 7.Double 66 =
  8. 8.Double 84 =
  9. 9.Double 57 =
  10. 10.Double 25 =
  11. 11.Half of 178 =
  12. 12.Double 52 =
  13. 13.Half of 196 =
  14. 14.Double 85 =
  15. 15.Half of 34 =
  16. 16.Half of 50 =
  17. 17.Half of 88 =
  18. 18.Half of 180 =
  19. 19.Double 17 =
  20. 20.Half of 122 =
  21. 21.Double 62 =
  22. 22.Double 99 =
  23. 23.Double 24 =
  24. 24.Half of 134 =
  25. 25.Half of 38 =
  26. 26.Double 29 =
  27. 27.Half of 192 =
  28. 28.Double 76 =
  29. 29.Half of 80 =
  30. 30.Half of 152 =
  31. 31.Half of 154 =
  32. 32.Double 91 =
  33. 33.Double 69 =
  34. 34.Double 71 =
  35. 35.Double 97 =
  36. 36.Half of 72 =
  37. 37.Double 83 =
  38. 38.Half of 64 =
  39. 39.Double 36 =
  40. 40.Double 89 =

Answer key

  1. 80
  2. 82
  3. 94
  4. 28
  5. 62
  6. 51
  7. 132
  8. 168
  9. 114
  10. 50
  11. 89
  12. 104
  13. 98
  14. 170
  15. 17
  16. 25
  17. 44
  18. 90
  19. 34
  20. 61
  21. 124
  22. 198
  23. 48
  24. 67
  25. 19
  26. 58
  27. 96
  28. 152
  29. 40
  30. 76
  31. 77
  32. 182
  33. 138
  34. 142
  35. 194
  36. 36
  37. 166
  38. 32
  39. 72
  40. 178

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