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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 92 · 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 24 =
  2. 2.Double 53 =
  3. 3.Double 17 =
  4. 4.Double 42 =
  5. 5.Double 27 =
  6. 6.Double 18 =
  7. 7.Double 92 =
  8. 8.Half of 68 =
  9. 9.Double 49 =
  10. 10.Half of 52 =
  11. 11.Double 19 =
  12. 12.Double 39 =
  13. 13.Half of 70 =
  14. 14.Half of 42 =
  15. 15.Half of 198 =
  16. 16.Half of 188 =
  17. 17.Half of 172 =
  18. 18.Double 69 =
  19. 19.Half of 82 =
  20. 20.Double 51 =
  21. 21.Double 68 =
  22. 22.Double 87 =
  23. 23.Double 67 =
  24. 24.Double 71 =
  25. 25.Half of 182 =
  26. 26.Double 72 =
  27. 27.Half of 30 =
  28. 28.Half of 174 =
  29. 29.Half of 152 =
  30. 30.Double 66 =
  31. 31.Half of 184 =
  32. 32.Double 34 =
  33. 33.Double 86 =
  34. 34.Double 56 =
  35. 35.Half of 166 =
  36. 36.Half of 150 =
  37. 37.Half of 124 =
  38. 38.Half of 190 =
  39. 39.Double 33 =
  40. 40.Double 54 =

Answer key

  1. 48
  2. 106
  3. 34
  4. 84
  5. 54
  6. 36
  7. 184
  8. 34
  9. 98
  10. 26
  11. 38
  12. 78
  13. 35
  14. 21
  15. 99
  16. 94
  17. 86
  18. 138
  19. 41
  20. 102
  21. 136
  22. 174
  23. 134
  24. 142
  25. 91
  26. 144
  27. 15
  28. 87
  29. 76
  30. 132
  31. 92
  32. 68
  33. 172
  34. 112
  35. 83
  36. 75
  37. 62
  38. 95
  39. 66
  40. 108

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