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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 216 · 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 85 =
  2. 2.Double 75 =
  3. 3.Half of 182 =
  4. 4.Half of 60 =
  5. 5.Double 83 =
  6. 6.Double 32 =
  7. 7.Double 54 =
  8. 8.Half of 98 =
  9. 9.Half of 132 =
  10. 10.Double 22 =
  11. 11.Half of 110 =
  12. 12.Half of 124 =
  13. 13.Half of 102 =
  14. 14.Double 87 =
  15. 15.Double 31 =
  16. 16.Half of 130 =
  17. 17.Double 21 =
  18. 18.Double 78 =
  19. 19.Double 63 =
  20. 20.Double 59 =
  21. 21.Double 19 =
  22. 22.Half of 194 =
  23. 23.Half of 96 =
  24. 24.Double 69 =
  25. 25.Double 82 =
  26. 26.Half of 176 =
  27. 27.Half of 80 =
  28. 28.Half of 116 =
  29. 29.Double 36 =
  30. 30.Half of 154 =
  31. 31.Double 97 =
  32. 32.Double 73 =
  33. 33.Half of 138 =
  34. 34.Half of 64 =
  35. 35.Double 57 =
  36. 36.Half of 186 =
  37. 37.Double 91 =
  38. 38.Half of 150 =
  39. 39.Half of 180 =
  40. 40.Double 37 =

Answer key

  1. 170
  2. 150
  3. 91
  4. 30
  5. 166
  6. 64
  7. 108
  8. 49
  9. 66
  10. 44
  11. 55
  12. 62
  13. 51
  14. 174
  15. 62
  16. 65
  17. 42
  18. 156
  19. 126
  20. 118
  21. 38
  22. 97
  23. 48
  24. 138
  25. 164
  26. 88
  27. 40
  28. 58
  29. 72
  30. 77
  31. 194
  32. 146
  33. 69
  34. 32
  35. 114
  36. 93
  37. 182
  38. 75
  39. 90
  40. 74

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