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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 185 · 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 38 =
  2. 2.Double 99 =
  3. 3.Double 83 =
  4. 4.Double 91 =
  5. 5.Double 46 =
  6. 6.Double 73 =
  7. 7.Double 36 =
  8. 8.Double 71 =
  9. 9.Half of 154 =
  10. 10.Double 65 =
  11. 11.Double 92 =
  12. 12.Double 23 =
  13. 13.Double 74 =
  14. 14.Double 21 =
  15. 15.Double 95 =
  16. 16.Half of 126 =
  17. 17.Half of 78 =
  18. 18.Double 96 =
  19. 19.Half of 72 =
  20. 20.Half of 38 =
  21. 21.Half of 120 =
  22. 22.Double 63 =
  23. 23.Double 51 =
  24. 24.Double 89 =
  25. 25.Double 66 =
  26. 26.Double 69 =
  27. 27.Double 79 =
  28. 28.Half of 74 =
  29. 29.Double 62 =
  30. 30.Half of 186 =
  31. 31.Double 54 =
  32. 32.Half of 156 =
  33. 33.Half of 170 =
  34. 34.Half of 142 =
  35. 35.Double 86 =
  36. 36.Half of 90 =
  37. 37.Half of 192 =
  38. 38.Half of 176 =
  39. 39.Half of 54 =
  40. 40.Double 33 =

Answer key

  1. 76
  2. 198
  3. 166
  4. 182
  5. 92
  6. 146
  7. 72
  8. 142
  9. 77
  10. 130
  11. 184
  12. 46
  13. 148
  14. 42
  15. 190
  16. 63
  17. 39
  18. 192
  19. 36
  20. 19
  21. 60
  22. 126
  23. 102
  24. 178
  25. 132
  26. 138
  27. 158
  28. 37
  29. 124
  30. 93
  31. 108
  32. 78
  33. 85
  34. 71
  35. 172
  36. 45
  37. 96
  38. 88
  39. 27
  40. 66

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