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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 678 · 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 102 =
  2. 2.Half of 134 =
  3. 3.Half of 166 =
  4. 4.Half of 38 =
  5. 5.Double 99 =
  6. 6.Double 41 =
  7. 7.Double 82 =
  8. 8.Half of 118 =
  9. 9.Half of 168 =
  10. 10.Half of 96 =
  11. 11.Half of 190 =
  12. 12.Double 38 =
  13. 13.Half of 56 =
  14. 14.Double 16 =
  15. 15.Half of 128 =
  16. 16.Double 69 =
  17. 17.Double 63 =
  18. 18.Double 94 =
  19. 19.Half of 66 =
  20. 20.Double 55 =
  21. 21.Half of 194 =
  22. 22.Double 29 =
  23. 23.Half of 68 =
  24. 24.Double 64 =
  25. 25.Half of 152 =
  26. 26.Double 98 =
  27. 27.Half of 100 =
  28. 28.Double 49 =
  29. 29.Double 95 =
  30. 30.Half of 120 =
  31. 31.Half of 182 =
  32. 32.Half of 186 =
  33. 33.Half of 174 =
  34. 34.Half of 80 =
  35. 35.Double 42 =
  36. 36.Double 27 =
  37. 37.Half of 32 =
  38. 38.Half of 52 =
  39. 39.Half of 30 =
  40. 40.Half of 58 =

Answer key

  1. 51
  2. 67
  3. 83
  4. 19
  5. 198
  6. 82
  7. 164
  8. 59
  9. 84
  10. 48
  11. 95
  12. 76
  13. 28
  14. 32
  15. 64
  16. 138
  17. 126
  18. 188
  19. 33
  20. 110
  21. 97
  22. 58
  23. 34
  24. 128
  25. 76
  26. 196
  27. 50
  28. 98
  29. 190
  30. 60
  31. 91
  32. 93
  33. 87
  34. 40
  35. 84
  36. 54
  37. 16
  38. 26
  39. 15
  40. 29

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