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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 982 · 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 118 =
  2. 2.Half of 154 =
  3. 3.Double 67 =
  4. 4.Half of 164 =
  5. 5.Double 27 =
  6. 6.Half of 48 =
  7. 7.Double 37 =
  8. 8.Half of 96 =
  9. 9.Half of 58 =
  10. 10.Double 95 =
  11. 11.Half of 76 =
  12. 12.Half of 26 =
  13. 13.Double 22 =
  14. 14.Double 91 =
  15. 15.Double 65 =
  16. 16.Double 41 =
  17. 17.Half of 82 =
  18. 18.Half of 72 =
  19. 19.Half of 106 =
  20. 20.Double 84 =
  21. 21.Double 87 =
  22. 22.Half of 50 =
  23. 23.Half of 132 =
  24. 24.Half of 148 =
  25. 25.Half of 34 =
  26. 26.Half of 152 =
  27. 27.Half of 168 =
  28. 28.Half of 110 =
  29. 29.Double 43 =
  30. 30.Double 51 =
  31. 31.Half of 160 =
  32. 32.Double 25 =
  33. 33.Double 49 =
  34. 34.Double 86 =
  35. 35.Half of 172 =
  36. 36.Half of 70 =
  37. 37.Double 79 =
  38. 38.Double 89 =
  39. 39.Half of 150 =
  40. 40.Double 75 =

Answer key

  1. 59
  2. 77
  3. 134
  4. 82
  5. 54
  6. 24
  7. 74
  8. 48
  9. 29
  10. 190
  11. 38
  12. 13
  13. 44
  14. 182
  15. 130
  16. 82
  17. 41
  18. 36
  19. 53
  20. 168
  21. 174
  22. 25
  23. 66
  24. 74
  25. 17
  26. 76
  27. 84
  28. 55
  29. 86
  30. 102
  31. 80
  32. 50
  33. 98
  34. 172
  35. 86
  36. 35
  37. 158
  38. 178
  39. 75
  40. 150

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