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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 714 · 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 89 =
  2. 2.Half of 104 =
  3. 3.Double 91 =
  4. 4.Double 85 =
  5. 5.Double 75 =
  6. 6.Double 21 =
  7. 7.Half of 174 =
  8. 8.Double 61 =
  9. 9.Half of 78 =
  10. 10.Half of 136 =
  11. 11.Double 73 =
  12. 12.Half of 180 =
  13. 13.Double 69 =
  14. 14.Double 25 =
  15. 15.Half of 192 =
  16. 16.Double 83 =
  17. 17.Double 72 =
  18. 18.Half of 108 =
  19. 19.Double 95 =
  20. 20.Half of 122 =
  21. 21.Double 22 =
  22. 22.Half of 26 =
  23. 23.Double 53 =
  24. 24.Half of 82 =
  25. 25.Half of 56 =
  26. 26.Half of 90 =
  27. 27.Double 31 =
  28. 28.Double 47 =
  29. 29.Double 78 =
  30. 30.Double 59 =
  31. 31.Double 52 =
  32. 32.Half of 184 =
  33. 33.Half of 190 =
  34. 34.Double 27 =
  35. 35.Half of 98 =
  36. 36.Double 42 =
  37. 37.Half of 160 =
  38. 38.Half of 68 =
  39. 39.Double 96 =
  40. 40.Double 49 =

Answer key

  1. 178
  2. 52
  3. 182
  4. 170
  5. 150
  6. 42
  7. 87
  8. 122
  9. 39
  10. 68
  11. 146
  12. 90
  13. 138
  14. 50
  15. 96
  16. 166
  17. 144
  18. 54
  19. 190
  20. 61
  21. 44
  22. 13
  23. 106
  24. 41
  25. 28
  26. 45
  27. 62
  28. 94
  29. 156
  30. 118
  31. 104
  32. 92
  33. 95
  34. 54
  35. 49
  36. 84
  37. 80
  38. 34
  39. 192
  40. 98

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