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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 474 · 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.Half of 44 =
  2. 2.Double 27 =
  3. 3.Half of 122 =
  4. 4.Half of 166 =
  5. 5.Half of 60 =
  6. 6.Double 42 =
  7. 7.Double 41 =
  8. 8.Double 37 =
  9. 9.Half of 94 =
  10. 10.Double 44 =
  11. 11.Half of 144 =
  12. 12.Double 36 =
  13. 13.Half of 186 =
  14. 14.Double 69 =
  15. 15.Double 64 =
  16. 16.Half of 116 =
  17. 17.Half of 130 =
  18. 18.Half of 84 =
  19. 19.Half of 46 =
  20. 20.Half of 50 =
  21. 21.Half of 152 =
  22. 22.Half of 194 =
  23. 23.Half of 188 =
  24. 24.Double 61 =
  25. 25.Double 52 =
  26. 26.Half of 140 =
  27. 27.Double 16 =
  28. 28.Double 81 =
  29. 29.Double 73 =
  30. 30.Double 25 =
  31. 31.Double 93 =
  32. 32.Half of 48 =
  33. 33.Half of 148 =
  34. 34.Double 53 =
  35. 35.Half of 112 =
  36. 36.Half of 198 =
  37. 37.Half of 128 =
  38. 38.Double 98 =
  39. 39.Double 18 =
  40. 40.Double 31 =

Answer key

  1. 22
  2. 54
  3. 61
  4. 83
  5. 30
  6. 84
  7. 82
  8. 74
  9. 47
  10. 88
  11. 72
  12. 72
  13. 93
  14. 138
  15. 128
  16. 58
  17. 65
  18. 42
  19. 23
  20. 25
  21. 76
  22. 97
  23. 94
  24. 122
  25. 104
  26. 70
  27. 32
  28. 162
  29. 146
  30. 50
  31. 186
  32. 24
  33. 74
  34. 106
  35. 56
  36. 99
  37. 64
  38. 196
  39. 36
  40. 62

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