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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 386 · 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 84 =
  2. 2.Double 69 =
  3. 3.Half of 36 =
  4. 4.Double 91 =
  5. 5.Half of 148 =
  6. 6.Half of 42 =
  7. 7.Half of 40 =
  8. 8.Half of 146 =
  9. 9.Half of 72 =
  10. 10.Half of 44 =
  11. 11.Double 45 =
  12. 12.Half of 96 =
  13. 13.Half of 38 =
  14. 14.Half of 76 =
  15. 15.Double 33 =
  16. 16.Half of 174 =
  17. 17.Double 36 =
  18. 18.Double 21 =
  19. 19.Half of 140 =
  20. 20.Half of 198 =
  21. 21.Half of 66 =
  22. 22.Double 46 =
  23. 23.Half of 172 =
  24. 24.Double 83 =
  25. 25.Double 35 =
  26. 26.Double 34 =
  27. 27.Double 39 =
  28. 28.Double 95 =
  29. 29.Half of 162 =
  30. 30.Double 79 =
  31. 31.Half of 192 =
  32. 32.Half of 74 =
  33. 33.Double 18 =
  34. 34.Half of 194 =
  35. 35.Half of 32 =
  36. 36.Double 32 =
  37. 37.Double 23 =
  38. 38.Half of 62 =
  39. 39.Half of 30 =
  40. 40.Half of 178 =

Answer key

  1. 42
  2. 138
  3. 18
  4. 182
  5. 74
  6. 21
  7. 20
  8. 73
  9. 36
  10. 22
  11. 90
  12. 48
  13. 19
  14. 38
  15. 66
  16. 87
  17. 72
  18. 42
  19. 70
  20. 99
  21. 33
  22. 92
  23. 86
  24. 166
  25. 70
  26. 68
  27. 78
  28. 190
  29. 81
  30. 158
  31. 96
  32. 37
  33. 36
  34. 97
  35. 16
  36. 64
  37. 46
  38. 31
  39. 15
  40. 89

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