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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 532 · 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 99 =
  2. 2.Half of 90 =
  3. 3.Double 41 =
  4. 4.Half of 62 =
  5. 5.Half of 104 =
  6. 6.Half of 174 =
  7. 7.Double 67 =
  8. 8.Double 89 =
  9. 9.Double 46 =
  10. 10.Double 24 =
  11. 11.Double 97 =
  12. 12.Double 75 =
  13. 13.Double 91 =
  14. 14.Double 21 =
  15. 15.Half of 72 =
  16. 16.Half of 76 =
  17. 17.Double 57 =
  18. 18.Double 58 =
  19. 19.Half of 42 =
  20. 20.Double 26 =
  21. 21.Double 31 =
  22. 22.Half of 96 =
  23. 23.Half of 100 =
  24. 24.Half of 130 =
  25. 25.Half of 134 =
  26. 26.Double 23 =
  27. 27.Double 38 =
  28. 28.Double 19 =
  29. 29.Half of 46 =
  30. 30.Double 82 =
  31. 31.Double 64 =
  32. 32.Double 49 =
  33. 33.Half of 112 =
  34. 34.Double 43 =
  35. 35.Double 81 =
  36. 36.Half of 52 =
  37. 37.Half of 146 =
  38. 38.Half of 192 =
  39. 39.Half of 98 =
  40. 40.Half of 64 =

Answer key

  1. 198
  2. 45
  3. 82
  4. 31
  5. 52
  6. 87
  7. 134
  8. 178
  9. 92
  10. 48
  11. 194
  12. 150
  13. 182
  14. 42
  15. 36
  16. 38
  17. 114
  18. 116
  19. 21
  20. 52
  21. 62
  22. 48
  23. 50
  24. 65
  25. 67
  26. 46
  27. 76
  28. 38
  29. 23
  30. 164
  31. 128
  32. 98
  33. 56
  34. 86
  35. 162
  36. 26
  37. 73
  38. 96
  39. 49
  40. 32

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