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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 504 · 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 46 =
  2. 2.Double 82 =
  3. 3.Half of 162 =
  4. 4.Double 41 =
  5. 5.Double 75 =
  6. 6.Half of 132 =
  7. 7.Double 35 =
  8. 8.Half of 180 =
  9. 9.Half of 138 =
  10. 10.Double 72 =
  11. 11.Double 45 =
  12. 12.Double 86 =
  13. 13.Half of 56 =
  14. 14.Half of 198 =
  15. 15.Double 38 =
  16. 16.Half of 170 =
  17. 17.Half of 130 =
  18. 18.Double 16 =
  19. 19.Half of 108 =
  20. 20.Half of 58 =
  21. 21.Half of 34 =
  22. 22.Double 37 =
  23. 23.Half of 118 =
  24. 24.Double 21 =
  25. 25.Half of 156 =
  26. 26.Half of 112 =
  27. 27.Double 33 =
  28. 28.Half of 92 =
  29. 29.Double 73 =
  30. 30.Half of 36 =
  31. 31.Double 51 =
  32. 32.Double 69 =
  33. 33.Double 91 =
  34. 34.Double 71 =
  35. 35.Half of 182 =
  36. 36.Double 47 =
  37. 37.Half of 94 =
  38. 38.Double 66 =
  39. 39.Half of 100 =
  40. 40.Half of 158 =

Answer key

  1. 92
  2. 164
  3. 81
  4. 82
  5. 150
  6. 66
  7. 70
  8. 90
  9. 69
  10. 144
  11. 90
  12. 172
  13. 28
  14. 99
  15. 76
  16. 85
  17. 65
  18. 32
  19. 54
  20. 29
  21. 17
  22. 74
  23. 59
  24. 42
  25. 78
  26. 56
  27. 66
  28. 46
  29. 146
  30. 18
  31. 102
  32. 138
  33. 182
  34. 142
  35. 91
  36. 94
  37. 47
  38. 132
  39. 50
  40. 79

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