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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 526 · 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 41 =
  2. 2.Double 32 =
  3. 3.Double 59 =
  4. 4.Double 49 =
  5. 5.Half of 124 =
  6. 6.Half of 40 =
  7. 7.Half of 120 =
  8. 8.Double 28 =
  9. 9.Half of 184 =
  10. 10.Half of 62 =
  11. 11.Double 55 =
  12. 12.Double 27 =
  13. 13.Double 81 =
  14. 14.Double 19 =
  15. 15.Double 22 =
  16. 16.Half of 32 =
  17. 17.Double 69 =
  18. 18.Double 78 =
  19. 19.Double 97 =
  20. 20.Half of 66 =
  21. 21.Double 51 =
  22. 22.Double 52 =
  23. 23.Double 66 =
  24. 24.Half of 186 =
  25. 25.Half of 198 =
  26. 26.Half of 58 =
  27. 27.Half of 108 =
  28. 28.Double 47 =
  29. 29.Half of 60 =
  30. 30.Double 26 =
  31. 31.Half of 146 =
  32. 32.Half of 150 =
  33. 33.Half of 138 =
  34. 34.Double 43 =
  35. 35.Double 63 =
  36. 36.Half of 160 =
  37. 37.Half of 174 =
  38. 38.Double 31 =
  39. 39.Half of 188 =
  40. 40.Half of 194 =

Answer key

  1. 82
  2. 64
  3. 118
  4. 98
  5. 62
  6. 20
  7. 60
  8. 56
  9. 92
  10. 31
  11. 110
  12. 54
  13. 162
  14. 38
  15. 44
  16. 16
  17. 138
  18. 156
  19. 194
  20. 33
  21. 102
  22. 104
  23. 132
  24. 93
  25. 99
  26. 29
  27. 54
  28. 94
  29. 30
  30. 52
  31. 73
  32. 75
  33. 69
  34. 86
  35. 126
  36. 80
  37. 87
  38. 62
  39. 94
  40. 97

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