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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 912 · 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 82 =
  2. 2.Double 54 =
  3. 3.Half of 92 =
  4. 4.Half of 114 =
  5. 5.Half of 78 =
  6. 6.Half of 80 =
  7. 7.Half of 154 =
  8. 8.Half of 44 =
  9. 9.Double 33 =
  10. 10.Double 19 =
  11. 11.Half of 184 =
  12. 12.Double 48 =
  13. 13.Double 22 =
  14. 14.Double 26 =
  15. 15.Double 32 =
  16. 16.Double 98 =
  17. 17.Double 42 =
  18. 18.Double 41 =
  19. 19.Double 35 =
  20. 20.Double 64 =
  21. 21.Double 73 =
  22. 22.Half of 138 =
  23. 23.Half of 170 =
  24. 24.Half of 50 =
  25. 25.Half of 196 =
  26. 26.Double 97 =
  27. 27.Double 95 =
  28. 28.Double 36 =
  29. 29.Half of 180 =
  30. 30.Double 63 =
  31. 31.Half of 40 =
  32. 32.Double 58 =
  33. 33.Double 71 =
  34. 34.Double 44 =
  35. 35.Double 29 =
  36. 36.Double 18 =
  37. 37.Half of 148 =
  38. 38.Half of 194 =
  39. 39.Half of 192 =
  40. 40.Double 57 =

Answer key

  1. 41
  2. 108
  3. 46
  4. 57
  5. 39
  6. 40
  7. 77
  8. 22
  9. 66
  10. 38
  11. 92
  12. 96
  13. 44
  14. 52
  15. 64
  16. 196
  17. 84
  18. 82
  19. 70
  20. 128
  21. 146
  22. 69
  23. 85
  24. 25
  25. 98
  26. 194
  27. 190
  28. 72
  29. 90
  30. 126
  31. 20
  32. 116
  33. 142
  34. 88
  35. 58
  36. 36
  37. 74
  38. 97
  39. 96
  40. 114

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