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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 921 · 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 162 =
  2. 2.Double 17 =
  3. 3.Half of 134 =
  4. 4.Double 28 =
  5. 5.Double 18 =
  6. 6.Double 21 =
  7. 7.Half of 70 =
  8. 8.Half of 52 =
  9. 9.Half of 60 =
  10. 10.Double 56 =
  11. 11.Half of 30 =
  12. 12.Half of 106 =
  13. 13.Half of 190 =
  14. 14.Double 68 =
  15. 15.Double 43 =
  16. 16.Double 22 =
  17. 17.Double 99 =
  18. 18.Double 73 =
  19. 19.Double 42 =
  20. 20.Double 38 =
  21. 21.Double 44 =
  22. 22.Double 67 =
  23. 23.Double 76 =
  24. 24.Half of 164 =
  25. 25.Half of 82 =
  26. 26.Half of 58 =
  27. 27.Double 86 =
  28. 28.Half of 174 =
  29. 29.Double 29 =
  30. 30.Half of 186 =
  31. 31.Half of 156 =
  32. 32.Half of 126 =
  33. 33.Double 89 =
  34. 34.Half of 130 =
  35. 35.Double 82 =
  36. 36.Double 51 =
  37. 37.Double 91 =
  38. 38.Half of 94 =
  39. 39.Double 98 =
  40. 40.Half of 32 =

Answer key

  1. 81
  2. 34
  3. 67
  4. 56
  5. 36
  6. 42
  7. 35
  8. 26
  9. 30
  10. 112
  11. 15
  12. 53
  13. 95
  14. 136
  15. 86
  16. 44
  17. 198
  18. 146
  19. 84
  20. 76
  21. 88
  22. 134
  23. 152
  24. 82
  25. 41
  26. 29
  27. 172
  28. 87
  29. 58
  30. 93
  31. 78
  32. 63
  33. 178
  34. 65
  35. 164
  36. 102
  37. 182
  38. 47
  39. 196
  40. 16

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