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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 894 · 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 29 =
  2. 2.Half of 28 =
  3. 3.Half of 118 =
  4. 4.Half of 78 =
  5. 5.Half of 34 =
  6. 6.Double 75 =
  7. 7.Double 35 =
  8. 8.Double 41 =
  9. 9.Double 57 =
  10. 10.Double 95 =
  11. 11.Half of 80 =
  12. 12.Half of 38 =
  13. 13.Half of 42 =
  14. 14.Double 24 =
  15. 15.Half of 196 =
  16. 16.Double 81 =
  17. 17.Double 97 =
  18. 18.Double 27 =
  19. 19.Half of 154 =
  20. 20.Half of 74 =
  21. 21.Half of 172 =
  22. 22.Half of 64 =
  23. 23.Double 49 =
  24. 24.Half of 142 =
  25. 25.Double 94 =
  26. 26.Half of 152 =
  27. 27.Double 67 =
  28. 28.Half of 130 =
  29. 29.Double 82 =
  30. 30.Double 89 =
  31. 31.Double 18 =
  32. 32.Double 26 =
  33. 33.Half of 162 =
  34. 34.Half of 48 =
  35. 35.Half of 102 =
  36. 36.Double 76 =
  37. 37.Double 96 =
  38. 38.Half of 184 =
  39. 39.Half of 62 =
  40. 40.Half of 70 =

Answer key

  1. 58
  2. 14
  3. 59
  4. 39
  5. 17
  6. 150
  7. 70
  8. 82
  9. 114
  10. 190
  11. 40
  12. 19
  13. 21
  14. 48
  15. 98
  16. 162
  17. 194
  18. 54
  19. 77
  20. 37
  21. 86
  22. 32
  23. 98
  24. 71
  25. 188
  26. 76
  27. 134
  28. 65
  29. 164
  30. 178
  31. 36
  32. 52
  33. 81
  34. 24
  35. 51
  36. 152
  37. 192
  38. 92
  39. 31
  40. 35

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