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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 977 · 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 68 =
  2. 2.Double 97 =
  3. 3.Double 31 =
  4. 4.Double 36 =
  5. 5.Half of 66 =
  6. 6.Double 51 =
  7. 7.Half of 168 =
  8. 8.Half of 80 =
  9. 9.Double 86 =
  10. 10.Half of 110 =
  11. 11.Double 49 =
  12. 12.Double 29 =
  13. 13.Double 83 =
  14. 14.Half of 156 =
  15. 15.Half of 150 =
  16. 16.Half of 26 =
  17. 17.Double 59 =
  18. 18.Half of 144 =
  19. 19.Double 72 =
  20. 20.Double 16 =
  21. 21.Double 62 =
  22. 22.Half of 182 =
  23. 23.Double 89 =
  24. 24.Half of 48 =
  25. 25.Half of 148 =
  26. 26.Double 41 =
  27. 27.Double 24 =
  28. 28.Double 96 =
  29. 29.Half of 194 =
  30. 30.Double 81 =
  31. 31.Half of 120 =
  32. 32.Half of 34 =
  33. 33.Double 57 =
  34. 34.Double 56 =
  35. 35.Half of 32 =
  36. 36.Double 77 =
  37. 37.Half of 152 =
  38. 38.Half of 74 =
  39. 39.Half of 96 =
  40. 40.Half of 94 =

Answer key

  1. 34
  2. 194
  3. 62
  4. 72
  5. 33
  6. 102
  7. 84
  8. 40
  9. 172
  10. 55
  11. 98
  12. 58
  13. 166
  14. 78
  15. 75
  16. 13
  17. 118
  18. 72
  19. 144
  20. 32
  21. 124
  22. 91
  23. 178
  24. 24
  25. 74
  26. 82
  27. 48
  28. 192
  29. 97
  30. 162
  31. 60
  32. 17
  33. 114
  34. 112
  35. 16
  36. 154
  37. 76
  38. 37
  39. 48
  40. 47

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