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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 14 · 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 34 =
  2. 2.Double 66 =
  3. 3.Double 97 =
  4. 4.Half of 40 =
  5. 5.Double 74 =
  6. 6.Half of 170 =
  7. 7.Half of 44 =
  8. 8.Double 32 =
  9. 9.Double 91 =
  10. 10.Half of 136 =
  11. 11.Half of 124 =
  12. 12.Double 83 =
  13. 13.Double 17 =
  14. 14.Half of 96 =
  15. 15.Double 53 =
  16. 16.Half of 188 =
  17. 17.Double 51 =
  18. 18.Half of 122 =
  19. 19.Double 46 =
  20. 20.Half of 132 =
  21. 21.Double 72 =
  22. 22.Half of 72 =
  23. 23.Double 27 =
  24. 24.Double 54 =
  25. 25.Double 36 =
  26. 26.Double 82 =
  27. 27.Double 89 =
  28. 28.Half of 68 =
  29. 29.Double 96 =
  30. 30.Half of 46 =
  31. 31.Half of 140 =
  32. 32.Double 59 =
  33. 33.Half of 54 =
  34. 34.Half of 60 =
  35. 35.Half of 174 =
  36. 36.Double 73 =
  37. 37.Half of 158 =
  38. 38.Half of 52 =
  39. 39.Half of 88 =
  40. 40.Double 42 =

Answer key

  1. 68
  2. 132
  3. 194
  4. 20
  5. 148
  6. 85
  7. 22
  8. 64
  9. 182
  10. 68
  11. 62
  12. 166
  13. 34
  14. 48
  15. 106
  16. 94
  17. 102
  18. 61
  19. 92
  20. 66
  21. 144
  22. 36
  23. 54
  24. 108
  25. 72
  26. 164
  27. 178
  28. 34
  29. 192
  30. 23
  31. 70
  32. 118
  33. 27
  34. 30
  35. 87
  36. 146
  37. 79
  38. 26
  39. 44
  40. 84

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