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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 968 · 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 74 =
  2. 2.Half of 192 =
  3. 3.Double 21 =
  4. 4.Half of 156 =
  5. 5.Half of 110 =
  6. 6.Double 35 =
  7. 7.Half of 190 =
  8. 8.Double 25 =
  9. 9.Half of 174 =
  10. 10.Double 27 =
  11. 11.Double 51 =
  12. 12.Half of 168 =
  13. 13.Half of 198 =
  14. 14.Half of 178 =
  15. 15.Double 67 =
  16. 16.Half of 40 =
  17. 17.Double 77 =
  18. 18.Half of 78 =
  19. 19.Double 97 =
  20. 20.Double 53 =
  21. 21.Double 54 =
  22. 22.Double 28 =
  23. 23.Half of 166 =
  24. 24.Half of 42 =
  25. 25.Double 17 =
  26. 26.Half of 146 =
  27. 27.Double 81 =
  28. 28.Half of 172 =
  29. 29.Half of 164 =
  30. 30.Double 42 =
  31. 31.Double 61 =
  32. 32.Half of 92 =
  33. 33.Half of 182 =
  34. 34.Double 36 =
  35. 35.Double 32 =
  36. 36.Double 22 =
  37. 37.Half of 116 =
  38. 38.Double 73 =
  39. 39.Double 98 =
  40. 40.Half of 36 =

Answer key

  1. 37
  2. 96
  3. 42
  4. 78
  5. 55
  6. 70
  7. 95
  8. 50
  9. 87
  10. 54
  11. 102
  12. 84
  13. 99
  14. 89
  15. 134
  16. 20
  17. 154
  18. 39
  19. 194
  20. 106
  21. 108
  22. 56
  23. 83
  24. 21
  25. 34
  26. 73
  27. 162
  28. 86
  29. 82
  30. 84
  31. 122
  32. 46
  33. 91
  34. 72
  35. 64
  36. 44
  37. 58
  38. 146
  39. 196
  40. 18

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