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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 882 · 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 61 =
  2. 2.Half of 194 =
  3. 3.Half of 54 =
  4. 4.Half of 108 =
  5. 5.Double 36 =
  6. 6.Half of 40 =
  7. 7.Double 21 =
  8. 8.Double 95 =
  9. 9.Half of 92 =
  10. 10.Half of 124 =
  11. 11.Half of 98 =
  12. 12.Half of 56 =
  13. 13.Half of 104 =
  14. 14.Half of 88 =
  15. 15.Half of 142 =
  16. 16.Double 43 =
  17. 17.Half of 36 =
  18. 18.Half of 170 =
  19. 19.Double 91 =
  20. 20.Double 28 =
  21. 21.Half of 84 =
  22. 22.Double 82 =
  23. 23.Double 35 =
  24. 24.Double 81 =
  25. 25.Half of 102 =
  26. 26.Double 58 =
  27. 27.Double 69 =
  28. 28.Half of 164 =
  29. 29.Double 72 =
  30. 30.Double 51 =
  31. 31.Double 75 =
  32. 32.Half of 34 =
  33. 33.Half of 60 =
  34. 34.Double 16 =
  35. 35.Half of 144 =
  36. 36.Double 83 =
  37. 37.Double 97 =
  38. 38.Double 45 =
  39. 39.Double 31 =
  40. 40.Half of 74 =

Answer key

  1. 122
  2. 97
  3. 27
  4. 54
  5. 72
  6. 20
  7. 42
  8. 190
  9. 46
  10. 62
  11. 49
  12. 28
  13. 52
  14. 44
  15. 71
  16. 86
  17. 18
  18. 85
  19. 182
  20. 56
  21. 42
  22. 164
  23. 70
  24. 162
  25. 51
  26. 116
  27. 138
  28. 82
  29. 144
  30. 102
  31. 150
  32. 17
  33. 30
  34. 32
  35. 72
  36. 166
  37. 194
  38. 90
  39. 62
  40. 37

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