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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 43 · 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 71 =
  2. 2.Double 59 =
  3. 3.Half of 170 =
  4. 4.Double 46 =
  5. 5.Half of 156 =
  6. 6.Double 21 =
  7. 7.Double 65 =
  8. 8.Half of 122 =
  9. 9.Half of 192 =
  10. 10.Double 34 =
  11. 11.Double 87 =
  12. 12.Double 61 =
  13. 13.Half of 182 =
  14. 14.Double 93 =
  15. 15.Half of 34 =
  16. 16.Double 54 =
  17. 17.Double 35 =
  18. 18.Double 31 =
  19. 19.Half of 134 =
  20. 20.Half of 48 =
  21. 21.Half of 78 =
  22. 22.Double 55 =
  23. 23.Double 25 =
  24. 24.Double 41 =
  25. 25.Half of 66 =
  26. 26.Half of 40 =
  27. 27.Half of 52 =
  28. 28.Half of 60 =
  29. 29.Half of 164 =
  30. 30.Half of 198 =
  31. 31.Double 37 =
  32. 32.Double 73 =
  33. 33.Double 78 =
  34. 34.Double 85 =
  35. 35.Half of 36 =
  36. 36.Double 66 =
  37. 37.Double 51 =
  38. 38.Half of 94 =
  39. 39.Double 19 =
  40. 40.Double 79 =

Answer key

  1. 142
  2. 118
  3. 85
  4. 92
  5. 78
  6. 42
  7. 130
  8. 61
  9. 96
  10. 68
  11. 174
  12. 122
  13. 91
  14. 186
  15. 17
  16. 108
  17. 70
  18. 62
  19. 67
  20. 24
  21. 39
  22. 110
  23. 50
  24. 82
  25. 33
  26. 20
  27. 26
  28. 30
  29. 82
  30. 99
  31. 74
  32. 146
  33. 156
  34. 170
  35. 18
  36. 132
  37. 102
  38. 47
  39. 38
  40. 158

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