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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 802 · 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 17 =
  2. 2.Half of 188 =
  3. 3.Double 71 =
  4. 4.Half of 70 =
  5. 5.Double 47 =
  6. 6.Double 75 =
  7. 7.Half of 166 =
  8. 8.Double 73 =
  9. 9.Double 95 =
  10. 10.Double 33 =
  11. 11.Double 88 =
  12. 12.Half of 124 =
  13. 13.Half of 56 =
  14. 14.Half of 72 =
  15. 15.Double 81 =
  16. 16.Half of 58 =
  17. 17.Double 69 =
  18. 18.Half of 78 =
  19. 19.Half of 32 =
  20. 20.Double 41 =
  21. 21.Double 99 =
  22. 22.Half of 98 =
  23. 23.Half of 154 =
  24. 24.Half of 92 =
  25. 25.Double 65 =
  26. 26.Double 55 =
  27. 27.Half of 88 =
  28. 28.Double 31 =
  29. 29.Double 93 =
  30. 30.Half of 132 =
  31. 31.Half of 104 =
  32. 32.Double 51 =
  33. 33.Half of 156 =
  34. 34.Double 61 =
  35. 35.Half of 116 =
  36. 36.Half of 158 =
  37. 37.Half of 118 =
  38. 38.Half of 122 =
  39. 39.Double 25 =
  40. 40.Half of 86 =

Answer key

  1. 34
  2. 94
  3. 142
  4. 35
  5. 94
  6. 150
  7. 83
  8. 146
  9. 190
  10. 66
  11. 176
  12. 62
  13. 28
  14. 36
  15. 162
  16. 29
  17. 138
  18. 39
  19. 16
  20. 82
  21. 198
  22. 49
  23. 77
  24. 46
  25. 130
  26. 110
  27. 44
  28. 62
  29. 186
  30. 66
  31. 52
  32. 102
  33. 78
  34. 122
  35. 58
  36. 79
  37. 59
  38. 61
  39. 50
  40. 43

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