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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 569 · 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 32 =
  2. 2.Double 25 =
  3. 3.Half of 54 =
  4. 4.Double 81 =
  5. 5.Double 77 =
  6. 6.Half of 92 =
  7. 7.Double 55 =
  8. 8.Half of 158 =
  9. 9.Half of 34 =
  10. 10.Double 41 =
  11. 11.Half of 48 =
  12. 12.Double 88 =
  13. 13.Half of 60 =
  14. 14.Double 68 =
  15. 15.Double 27 =
  16. 16.Half of 160 =
  17. 17.Double 76 =
  18. 18.Half of 102 =
  19. 19.Double 62 =
  20. 20.Half of 116 =
  21. 21.Double 63 =
  22. 22.Half of 180 =
  23. 23.Half of 110 =
  24. 24.Half of 58 =
  25. 25.Double 23 =
  26. 26.Half of 144 =
  27. 27.Half of 68 =
  28. 28.Double 48 =
  29. 29.Double 31 =
  30. 30.Double 39 =
  31. 31.Double 35 =
  32. 32.Double 99 =
  33. 33.Double 64 =
  34. 34.Double 72 =
  35. 35.Double 57 =
  36. 36.Double 61 =
  37. 37.Double 91 =
  38. 38.Half of 44 =
  39. 39.Half of 176 =
  40. 40.Double 66 =

Answer key

  1. 16
  2. 50
  3. 27
  4. 162
  5. 154
  6. 46
  7. 110
  8. 79
  9. 17
  10. 82
  11. 24
  12. 176
  13. 30
  14. 136
  15. 54
  16. 80
  17. 152
  18. 51
  19. 124
  20. 58
  21. 126
  22. 90
  23. 55
  24. 29
  25. 46
  26. 72
  27. 34
  28. 96
  29. 62
  30. 78
  31. 70
  32. 198
  33. 128
  34. 144
  35. 114
  36. 122
  37. 182
  38. 22
  39. 88
  40. 132

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