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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 794 · 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 66 =
  2. 2.Half of 42 =
  3. 3.Half of 144 =
  4. 4.Double 23 =
  5. 5.Double 51 =
  6. 6.Half of 72 =
  7. 7.Double 38 =
  8. 8.Half of 78 =
  9. 9.Half of 100 =
  10. 10.Double 21 =
  11. 11.Double 28 =
  12. 12.Double 63 =
  13. 13.Double 92 =
  14. 14.Half of 190 =
  15. 15.Half of 98 =
  16. 16.Half of 120 =
  17. 17.Half of 174 =
  18. 18.Double 41 =
  19. 19.Half of 188 =
  20. 20.Half of 156 =
  21. 21.Double 72 =
  22. 22.Half of 84 =
  23. 23.Half of 58 =
  24. 24.Double 59 =
  25. 25.Double 17 =
  26. 26.Double 93 =
  27. 27.Half of 90 =
  28. 28.Half of 64 =
  29. 29.Half of 152 =
  30. 30.Half of 46 =
  31. 31.Double 74 =
  32. 32.Half of 198 =
  33. 33.Double 89 =
  34. 34.Half of 94 =
  35. 35.Double 95 =
  36. 36.Half of 178 =
  37. 37.Double 36 =
  38. 38.Double 31 =
  39. 39.Double 56 =
  40. 40.Double 84 =

Answer key

  1. 132
  2. 21
  3. 72
  4. 46
  5. 102
  6. 36
  7. 76
  8. 39
  9. 50
  10. 42
  11. 56
  12. 126
  13. 184
  14. 95
  15. 49
  16. 60
  17. 87
  18. 82
  19. 94
  20. 78
  21. 144
  22. 42
  23. 29
  24. 118
  25. 34
  26. 186
  27. 45
  28. 32
  29. 76
  30. 23
  31. 148
  32. 99
  33. 178
  34. 47
  35. 190
  36. 89
  37. 72
  38. 62
  39. 112
  40. 168

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