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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 98 · 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 82 =
  2. 2.Half of 74 =
  3. 3.Half of 134 =
  4. 4.Half of 72 =
  5. 5.Half of 152 =
  6. 6.Double 86 =
  7. 7.Half of 172 =
  8. 8.Half of 168 =
  9. 9.Double 81 =
  10. 10.Half of 124 =
  11. 11.Half of 188 =
  12. 12.Double 37 =
  13. 13.Half of 52 =
  14. 14.Double 52 =
  15. 15.Half of 28 =
  16. 16.Half of 114 =
  17. 17.Half of 162 =
  18. 18.Double 31 =
  19. 19.Half of 40 =
  20. 20.Double 79 =
  21. 21.Double 98 =
  22. 22.Double 65 =
  23. 23.Double 84 =
  24. 24.Double 48 =
  25. 25.Half of 98 =
  26. 26.Half of 88 =
  27. 27.Half of 32 =
  28. 28.Double 72 =
  29. 29.Half of 166 =
  30. 30.Double 62 =
  31. 31.Double 58 =
  32. 32.Half of 132 =
  33. 33.Double 33 =
  34. 34.Double 27 =
  35. 35.Half of 50 =
  36. 36.Half of 196 =
  37. 37.Half of 104 =
  38. 38.Double 88 =
  39. 39.Half of 106 =
  40. 40.Half of 160 =

Answer key

  1. 164
  2. 37
  3. 67
  4. 36
  5. 76
  6. 172
  7. 86
  8. 84
  9. 162
  10. 62
  11. 94
  12. 74
  13. 26
  14. 104
  15. 14
  16. 57
  17. 81
  18. 62
  19. 20
  20. 158
  21. 196
  22. 130
  23. 168
  24. 96
  25. 49
  26. 44
  27. 16
  28. 144
  29. 83
  30. 124
  31. 116
  32. 66
  33. 66
  34. 54
  35. 25
  36. 98
  37. 52
  38. 176
  39. 53
  40. 80

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