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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 44 · 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 68 =
  2. 2.Double 44 =
  3. 3.Double 97 =
  4. 4.Half of 90 =
  5. 5.Double 19 =
  6. 6.Double 54 =
  7. 7.Double 73 =
  8. 8.Half of 32 =
  9. 9.Half of 40 =
  10. 10.Half of 152 =
  11. 11.Double 43 =
  12. 12.Half of 164 =
  13. 13.Half of 112 =
  14. 14.Half of 30 =
  15. 15.Double 41 =
  16. 16.Double 82 =
  17. 17.Double 39 =
  18. 18.Double 99 =
  19. 19.Double 57 =
  20. 20.Half of 196 =
  21. 21.Double 33 =
  22. 22.Half of 124 =
  23. 23.Double 84 =
  24. 24.Half of 74 =
  25. 25.Half of 36 =
  26. 26.Half of 78 =
  27. 27.Half of 54 =
  28. 28.Half of 106 =
  29. 29.Double 59 =
  30. 30.Half of 60 =
  31. 31.Double 98 =
  32. 32.Half of 34 =
  33. 33.Double 78 =
  34. 34.Half of 62 =
  35. 35.Double 48 =
  36. 36.Half of 96 =
  37. 37.Double 42 =
  38. 38.Double 55 =
  39. 39.Half of 102 =
  40. 40.Half of 194 =

Answer key

  1. 136
  2. 88
  3. 194
  4. 45
  5. 38
  6. 108
  7. 146
  8. 16
  9. 20
  10. 76
  11. 86
  12. 82
  13. 56
  14. 15
  15. 82
  16. 164
  17. 78
  18. 198
  19. 114
  20. 98
  21. 66
  22. 62
  23. 168
  24. 37
  25. 18
  26. 39
  27. 27
  28. 53
  29. 118
  30. 30
  31. 196
  32. 17
  33. 156
  34. 31
  35. 96
  36. 48
  37. 84
  38. 110
  39. 51
  40. 97

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