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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 373 · 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 172 =
  2. 2.Half of 32 =
  3. 3.Half of 112 =
  4. 4.Half of 62 =
  5. 5.Double 37 =
  6. 6.Half of 72 =
  7. 7.Double 48 =
  8. 8.Half of 184 =
  9. 9.Double 17 =
  10. 10.Half of 124 =
  11. 11.Half of 198 =
  12. 12.Half of 48 =
  13. 13.Half of 166 =
  14. 14.Half of 36 =
  15. 15.Half of 104 =
  16. 16.Double 32 =
  17. 17.Double 18 =
  18. 18.Double 62 =
  19. 19.Half of 142 =
  20. 20.Double 23 =
  21. 21.Double 83 =
  22. 22.Half of 192 =
  23. 23.Half of 92 =
  24. 24.Double 51 =
  25. 25.Half of 180 =
  26. 26.Double 68 =
  27. 27.Half of 52 =
  28. 28.Double 81 =
  29. 29.Half of 128 =
  30. 30.Double 91 =
  31. 31.Double 52 =
  32. 32.Double 75 =
  33. 33.Double 71 =
  34. 34.Half of 146 =
  35. 35.Double 56 =
  36. 36.Double 72 =
  37. 37.Double 28 =
  38. 38.Half of 82 =
  39. 39.Double 44 =
  40. 40.Half of 134 =

Answer key

  1. 86
  2. 16
  3. 56
  4. 31
  5. 74
  6. 36
  7. 96
  8. 92
  9. 34
  10. 62
  11. 99
  12. 24
  13. 83
  14. 18
  15. 52
  16. 64
  17. 36
  18. 124
  19. 71
  20. 46
  21. 166
  22. 96
  23. 46
  24. 102
  25. 90
  26. 136
  27. 26
  28. 162
  29. 64
  30. 182
  31. 104
  32. 150
  33. 142
  34. 73
  35. 112
  36. 144
  37. 56
  38. 41
  39. 88
  40. 67

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