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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 11 · 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 48 =
  2. 2.Double 44 =
  3. 3.Double 95 =
  4. 4.Half of 82 =
  5. 5.Half of 194 =
  6. 6.Half of 146 =
  7. 7.Double 41 =
  8. 8.Double 77 =
  9. 9.Double 31 =
  10. 10.Double 39 =
  11. 11.Half of 28 =
  12. 12.Half of 110 =
  13. 13.Double 97 =
  14. 14.Half of 118 =
  15. 15.Double 33 =
  16. 16.Double 93 =
  17. 17.Half of 106 =
  18. 18.Double 73 =
  19. 19.Double 61 =
  20. 20.Half of 42 =
  21. 21.Half of 100 =
  22. 22.Double 59 =
  23. 23.Half of 34 =
  24. 24.Half of 26 =
  25. 25.Double 17 =
  26. 26.Double 25 =
  27. 27.Half of 160 =
  28. 28.Double 54 =
  29. 29.Double 88 =
  30. 30.Half of 56 =
  31. 31.Double 89 =
  32. 32.Double 86 =
  33. 33.Double 62 =
  34. 34.Double 58 =
  35. 35.Half of 188 =
  36. 36.Double 74 =
  37. 37.Half of 44 =
  38. 38.Half of 88 =
  39. 39.Half of 112 =
  40. 40.Half of 90 =

Answer key

  1. 96
  2. 88
  3. 190
  4. 41
  5. 97
  6. 73
  7. 82
  8. 154
  9. 62
  10. 78
  11. 14
  12. 55
  13. 194
  14. 59
  15. 66
  16. 186
  17. 53
  18. 146
  19. 122
  20. 21
  21. 50
  22. 118
  23. 17
  24. 13
  25. 34
  26. 50
  27. 80
  28. 108
  29. 176
  30. 28
  31. 178
  32. 172
  33. 124
  34. 116
  35. 94
  36. 148
  37. 22
  38. 44
  39. 56
  40. 45

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