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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 331 · 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 68 =
  2. 2.Double 84 =
  3. 3.Double 66 =
  4. 4.Double 71 =
  5. 5.Half of 62 =
  6. 6.Double 75 =
  7. 7.Half of 174 =
  8. 8.Half of 176 =
  9. 9.Double 51 =
  10. 10.Double 83 =
  11. 11.Half of 184 =
  12. 12.Half of 190 =
  13. 13.Double 92 =
  14. 14.Double 54 =
  15. 15.Half of 44 =
  16. 16.Double 42 =
  17. 17.Double 87 =
  18. 18.Double 88 =
  19. 19.Half of 32 =
  20. 20.Half of 56 =
  21. 21.Double 37 =
  22. 22.Double 35 =
  23. 23.Half of 136 =
  24. 24.Half of 168 =
  25. 25.Double 72 =
  26. 26.Double 25 =
  27. 27.Half of 178 =
  28. 28.Half of 78 =
  29. 29.Double 38 =
  30. 30.Half of 50 =
  31. 31.Double 94 =
  32. 32.Half of 148 =
  33. 33.Double 89 =
  34. 34.Half of 30 =
  35. 35.Half of 124 =
  36. 36.Double 82 =
  37. 37.Half of 192 =
  38. 38.Half of 26 =
  39. 39.Double 21 =
  40. 40.Double 81 =

Answer key

  1. 34
  2. 168
  3. 132
  4. 142
  5. 31
  6. 150
  7. 87
  8. 88
  9. 102
  10. 166
  11. 92
  12. 95
  13. 184
  14. 108
  15. 22
  16. 84
  17. 174
  18. 176
  19. 16
  20. 28
  21. 74
  22. 70
  23. 68
  24. 84
  25. 144
  26. 50
  27. 89
  28. 39
  29. 76
  30. 25
  31. 188
  32. 74
  33. 178
  34. 15
  35. 62
  36. 164
  37. 96
  38. 13
  39. 42
  40. 162

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