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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 549 · 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 87 =
  2. 2.Half of 168 =
  3. 3.Double 51 =
  4. 4.Half of 98 =
  5. 5.Half of 152 =
  6. 6.Half of 72 =
  7. 7.Half of 64 =
  8. 8.Double 31 =
  9. 9.Half of 130 =
  10. 10.Double 72 =
  11. 11.Double 95 =
  12. 12.Half of 74 =
  13. 13.Half of 78 =
  14. 14.Double 35 =
  15. 15.Half of 42 =
  16. 16.Half of 80 =
  17. 17.Double 36 =
  18. 18.Double 99 =
  19. 19.Half of 106 =
  20. 20.Half of 76 =
  21. 21.Double 28 =
  22. 22.Half of 40 =
  23. 23.Half of 36 =
  24. 24.Double 41 =
  25. 25.Half of 184 =
  26. 26.Half of 196 =
  27. 27.Double 79 =
  28. 28.Double 59 =
  29. 29.Half of 172 =
  30. 30.Half of 158 =
  31. 31.Half of 50 =
  32. 32.Double 63 =
  33. 33.Double 25 =
  34. 34.Half of 166 =
  35. 35.Half of 144 =
  36. 36.Half of 86 =
  37. 37.Double 46 =
  38. 38.Half of 110 =
  39. 39.Half of 44 =
  40. 40.Double 39 =

Answer key

  1. 174
  2. 84
  3. 102
  4. 49
  5. 76
  6. 36
  7. 32
  8. 62
  9. 65
  10. 144
  11. 190
  12. 37
  13. 39
  14. 70
  15. 21
  16. 40
  17. 72
  18. 198
  19. 53
  20. 38
  21. 56
  22. 20
  23. 18
  24. 82
  25. 92
  26. 98
  27. 158
  28. 118
  29. 86
  30. 79
  31. 25
  32. 126
  33. 50
  34. 83
  35. 72
  36. 43
  37. 92
  38. 55
  39. 22
  40. 78

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