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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 872 · 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.Double 55 =
  2. 2.Double 59 =
  3. 3.Double 57 =
  4. 4.Double 37 =
  5. 5.Half of 170 =
  6. 6.Half of 112 =
  7. 7.Double 62 =
  8. 8.Double 31 =
  9. 9.Half of 124 =
  10. 10.Double 64 =
  11. 11.Double 41 =
  12. 12.Double 42 =
  13. 13.Double 69 =
  14. 14.Half of 160 =
  15. 15.Half of 182 =
  16. 16.Double 22 =
  17. 17.Double 92 =
  18. 18.Half of 184 =
  19. 19.Half of 142 =
  20. 20.Double 21 =
  21. 21.Double 81 =
  22. 22.Double 26 =
  23. 23.Double 66 =
  24. 24.Double 71 =
  25. 25.Double 65 =
  26. 26.Double 79 =
  27. 27.Double 72 =
  28. 28.Half of 60 =
  29. 29.Half of 94 =
  30. 30.Double 39 =
  31. 31.Double 86 =
  32. 32.Double 51 =
  33. 33.Half of 98 =
  34. 34.Half of 84 =
  35. 35.Half of 76 =
  36. 36.Double 95 =
  37. 37.Half of 118 =
  38. 38.Half of 42 =
  39. 39.Half of 74 =
  40. 40.Double 46 =

Answer key

  1. 110
  2. 118
  3. 114
  4. 74
  5. 85
  6. 56
  7. 124
  8. 62
  9. 62
  10. 128
  11. 82
  12. 84
  13. 138
  14. 80
  15. 91
  16. 44
  17. 184
  18. 92
  19. 71
  20. 42
  21. 162
  22. 52
  23. 132
  24. 142
  25. 130
  26. 158
  27. 144
  28. 30
  29. 47
  30. 78
  31. 172
  32. 102
  33. 49
  34. 42
  35. 38
  36. 190
  37. 59
  38. 21
  39. 37
  40. 92

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