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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 801 · 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 91 =
  2. 2.Half of 132 =
  3. 3.Half of 142 =
  4. 4.Half of 178 =
  5. 5.Double 59 =
  6. 6.Double 38 =
  7. 7.Double 61 =
  8. 8.Double 65 =
  9. 9.Half of 166 =
  10. 10.Half of 42 =
  11. 11.Double 35 =
  12. 12.Double 69 =
  13. 13.Double 85 =
  14. 14.Half of 152 =
  15. 15.Half of 148 =
  16. 16.Half of 114 =
  17. 17.Half of 146 =
  18. 18.Double 36 =
  19. 19.Double 39 =
  20. 20.Half of 92 =
  21. 21.Half of 102 =
  22. 22.Half of 194 =
  23. 23.Double 42 =
  24. 24.Half of 84 =
  25. 25.Half of 106 =
  26. 26.Half of 168 =
  27. 27.Half of 88 =
  28. 28.Double 58 =
  29. 29.Double 67 =
  30. 30.Half of 28 =
  31. 31.Double 55 =
  32. 32.Double 19 =
  33. 33.Double 64 =
  34. 34.Half of 70 =
  35. 35.Half of 198 =
  36. 36.Double 47 =
  37. 37.Half of 140 =
  38. 38.Half of 54 =
  39. 39.Double 84 =
  40. 40.Half of 74 =

Answer key

  1. 182
  2. 66
  3. 71
  4. 89
  5. 118
  6. 76
  7. 122
  8. 130
  9. 83
  10. 21
  11. 70
  12. 138
  13. 170
  14. 76
  15. 74
  16. 57
  17. 73
  18. 72
  19. 78
  20. 46
  21. 51
  22. 97
  23. 84
  24. 42
  25. 53
  26. 84
  27. 44
  28. 116
  29. 134
  30. 14
  31. 110
  32. 38
  33. 128
  34. 35
  35. 99
  36. 94
  37. 70
  38. 27
  39. 168
  40. 37

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