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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 771 · 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 90 =
  2. 2.Double 33 =
  3. 3.Half of 74 =
  4. 4.Half of 114 =
  5. 5.Half of 178 =
  6. 6.Half of 198 =
  7. 7.Double 71 =
  8. 8.Half of 134 =
  9. 9.Half of 168 =
  10. 10.Half of 54 =
  11. 11.Half of 138 =
  12. 12.Double 55 =
  13. 13.Double 96 =
  14. 14.Double 19 =
  15. 15.Half of 80 =
  16. 16.Double 62 =
  17. 17.Half of 70 =
  18. 18.Half of 104 =
  19. 19.Double 17 =
  20. 20.Double 16 =
  21. 21.Double 97 =
  22. 22.Half of 58 =
  23. 23.Half of 194 =
  24. 24.Double 38 =
  25. 25.Double 52 =
  26. 26.Double 27 =
  27. 27.Double 88 =
  28. 28.Half of 66 =
  29. 29.Half of 188 =
  30. 30.Double 61 =
  31. 31.Half of 108 =
  32. 32.Half of 34 =
  33. 33.Half of 122 =
  34. 34.Half of 164 =
  35. 35.Double 81 =
  36. 36.Half of 156 =
  37. 37.Double 35 =
  38. 38.Double 76 =
  39. 39.Half of 162 =
  40. 40.Double 63 =

Answer key

  1. 45
  2. 66
  3. 37
  4. 57
  5. 89
  6. 99
  7. 142
  8. 67
  9. 84
  10. 27
  11. 69
  12. 110
  13. 192
  14. 38
  15. 40
  16. 124
  17. 35
  18. 52
  19. 34
  20. 32
  21. 194
  22. 29
  23. 97
  24. 76
  25. 104
  26. 54
  27. 176
  28. 33
  29. 94
  30. 122
  31. 54
  32. 17
  33. 61
  34. 82
  35. 162
  36. 78
  37. 70
  38. 152
  39. 81
  40. 126

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