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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 417 · 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 132 =
  2. 2.Half of 34 =
  3. 3.Double 96 =
  4. 4.Double 33 =
  5. 5.Double 54 =
  6. 6.Half of 96 =
  7. 7.Half of 68 =
  8. 8.Double 68 =
  9. 9.Half of 172 =
  10. 10.Half of 28 =
  11. 11.Half of 156 =
  12. 12.Half of 178 =
  13. 13.Half of 190 =
  14. 14.Double 73 =
  15. 15.Half of 114 =
  16. 16.Double 71 =
  17. 17.Double 28 =
  18. 18.Double 75 =
  19. 19.Double 93 =
  20. 20.Half of 140 =
  21. 21.Half of 198 =
  22. 22.Double 87 =
  23. 23.Double 69 =
  24. 24.Double 45 =
  25. 25.Double 34 =
  26. 26.Half of 40 =
  27. 27.Double 64 =
  28. 28.Double 37 =
  29. 29.Double 91 =
  30. 30.Double 31 =
  31. 31.Double 65 =
  32. 32.Double 46 =
  33. 33.Double 83 =
  34. 34.Half of 26 =
  35. 35.Half of 142 =
  36. 36.Double 35 =
  37. 37.Half of 48 =
  38. 38.Half of 118 =
  39. 39.Double 26 =
  40. 40.Half of 192 =

Answer key

  1. 66
  2. 17
  3. 192
  4. 66
  5. 108
  6. 48
  7. 34
  8. 136
  9. 86
  10. 14
  11. 78
  12. 89
  13. 95
  14. 146
  15. 57
  16. 142
  17. 56
  18. 150
  19. 186
  20. 70
  21. 99
  22. 174
  23. 138
  24. 90
  25. 68
  26. 20
  27. 128
  28. 74
  29. 182
  30. 62
  31. 130
  32. 92
  33. 166
  34. 13
  35. 71
  36. 70
  37. 24
  38. 59
  39. 52
  40. 96

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