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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 900 · 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 108 =
  2. 2.Double 75 =
  3. 3.Double 29 =
  4. 4.Double 65 =
  5. 5.Half of 142 =
  6. 6.Double 89 =
  7. 7.Double 51 =
  8. 8.Half of 158 =
  9. 9.Double 77 =
  10. 10.Double 71 =
  11. 11.Double 76 =
  12. 12.Half of 30 =
  13. 13.Half of 110 =
  14. 14.Double 98 =
  15. 15.Half of 48 =
  16. 16.Half of 104 =
  17. 17.Half of 88 =
  18. 18.Double 16 =
  19. 19.Half of 124 =
  20. 20.Half of 52 =
  21. 21.Half of 134 =
  22. 22.Double 35 =
  23. 23.Half of 156 =
  24. 24.Double 21 =
  25. 25.Double 39 =
  26. 26.Double 91 =
  27. 27.Half of 42 =
  28. 28.Double 82 =
  29. 29.Double 17 =
  30. 30.Half of 194 =
  31. 31.Double 57 =
  32. 32.Double 93 =
  33. 33.Half of 182 =
  34. 34.Half of 162 =
  35. 35.Double 44 =
  36. 36.Half of 116 =
  37. 37.Half of 154 =
  38. 38.Double 42 =
  39. 39.Half of 78 =
  40. 40.Double 22 =

Answer key

  1. 54
  2. 150
  3. 58
  4. 130
  5. 71
  6. 178
  7. 102
  8. 79
  9. 154
  10. 142
  11. 152
  12. 15
  13. 55
  14. 196
  15. 24
  16. 52
  17. 44
  18. 32
  19. 62
  20. 26
  21. 67
  22. 70
  23. 78
  24. 42
  25. 78
  26. 182
  27. 21
  28. 164
  29. 34
  30. 97
  31. 114
  32. 186
  33. 91
  34. 81
  35. 88
  36. 58
  37. 77
  38. 84
  39. 39
  40. 44

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