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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 578 · 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 98 =
  2. 2.Half of 198 =
  3. 3.Double 39 =
  4. 4.Double 81 =
  5. 5.Double 34 =
  6. 6.Half of 130 =
  7. 7.Double 69 =
  8. 8.Double 97 =
  9. 9.Double 96 =
  10. 10.Half of 68 =
  11. 11.Half of 120 =
  12. 12.Double 18 =
  13. 13.Half of 90 =
  14. 14.Half of 136 =
  15. 15.Double 86 =
  16. 16.Double 99 =
  17. 17.Half of 88 =
  18. 18.Half of 128 =
  19. 19.Double 44 =
  20. 20.Double 78 =
  21. 21.Double 27 =
  22. 22.Half of 34 =
  23. 23.Double 67 =
  24. 24.Half of 94 =
  25. 25.Double 61 =
  26. 26.Half of 64 =
  27. 27.Half of 116 =
  28. 28.Double 79 =
  29. 29.Double 73 =
  30. 30.Double 71 =
  31. 31.Half of 158 =
  32. 32.Double 29 =
  33. 33.Half of 84 =
  34. 34.Half of 174 =
  35. 35.Half of 102 =
  36. 36.Half of 122 =
  37. 37.Half of 50 =
  38. 38.Half of 54 =
  39. 39.Double 76 =
  40. 40.Double 55 =

Answer key

  1. 49
  2. 99
  3. 78
  4. 162
  5. 68
  6. 65
  7. 138
  8. 194
  9. 192
  10. 34
  11. 60
  12. 36
  13. 45
  14. 68
  15. 172
  16. 198
  17. 44
  18. 64
  19. 88
  20. 156
  21. 54
  22. 17
  23. 134
  24. 47
  25. 122
  26. 32
  27. 58
  28. 158
  29. 146
  30. 142
  31. 79
  32. 58
  33. 42
  34. 87
  35. 51
  36. 61
  37. 25
  38. 27
  39. 152
  40. 110

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