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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 605 · 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 40 =
  2. 2.Half of 100 =
  3. 3.Double 45 =
  4. 4.Double 17 =
  5. 5.Double 78 =
  6. 6.Half of 50 =
  7. 7.Double 94 =
  8. 8.Half of 190 =
  9. 9.Double 88 =
  10. 10.Double 34 =
  11. 11.Half of 60 =
  12. 12.Half of 96 =
  13. 13.Double 26 =
  14. 14.Double 38 =
  15. 15.Double 18 =
  16. 16.Half of 32 =
  17. 17.Double 72 =
  18. 18.Half of 196 =
  19. 19.Half of 186 =
  20. 20.Double 41 =
  21. 21.Half of 108 =
  22. 22.Half of 86 =
  23. 23.Double 31 =
  24. 24.Double 73 =
  25. 25.Half of 180 =
  26. 26.Half of 146 =
  27. 27.Double 51 =
  28. 28.Double 96 =
  29. 29.Half of 64 =
  30. 30.Double 91 =
  31. 31.Double 55 =
  32. 32.Half of 174 =
  33. 33.Double 76 =
  34. 34.Double 49 =
  35. 35.Half of 62 =
  36. 36.Double 56 =
  37. 37.Half of 136 =
  38. 38.Half of 158 =
  39. 39.Half of 68 =
  40. 40.Double 75 =

Answer key

  1. 20
  2. 50
  3. 90
  4. 34
  5. 156
  6. 25
  7. 188
  8. 95
  9. 176
  10. 68
  11. 30
  12. 48
  13. 52
  14. 76
  15. 36
  16. 16
  17. 144
  18. 98
  19. 93
  20. 82
  21. 54
  22. 43
  23. 62
  24. 146
  25. 90
  26. 73
  27. 102
  28. 192
  29. 32
  30. 182
  31. 110
  32. 87
  33. 152
  34. 98
  35. 31
  36. 112
  37. 68
  38. 79
  39. 34
  40. 150

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