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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 933 · 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 78 =
  2. 2.Half of 80 =
  3. 3.Double 23 =
  4. 4.Double 46 =
  5. 5.Double 36 =
  6. 6.Half of 192 =
  7. 7.Half of 108 =
  8. 8.Half of 46 =
  9. 9.Half of 82 =
  10. 10.Double 18 =
  11. 11.Double 81 =
  12. 12.Half of 172 =
  13. 13.Half of 154 =
  14. 14.Half of 190 =
  15. 15.Half of 28 =
  16. 16.Half of 194 =
  17. 17.Double 39 =
  18. 18.Double 32 =
  19. 19.Double 17 =
  20. 20.Half of 90 =
  21. 21.Half of 126 =
  22. 22.Double 49 =
  23. 23.Half of 114 =
  24. 24.Half of 88 =
  25. 25.Half of 98 =
  26. 26.Half of 148 =
  27. 27.Half of 104 =
  28. 28.Half of 134 =
  29. 29.Half of 50 =
  30. 30.Half of 150 =
  31. 31.Half of 186 =
  32. 32.Double 24 =
  33. 33.Double 26 =
  34. 34.Double 67 =
  35. 35.Half of 74 =
  36. 36.Half of 184 =
  37. 37.Double 58 =
  38. 38.Half of 180 =
  39. 39.Half of 26 =
  40. 40.Half of 196 =

Answer key

  1. 156
  2. 40
  3. 46
  4. 92
  5. 72
  6. 96
  7. 54
  8. 23
  9. 41
  10. 36
  11. 162
  12. 86
  13. 77
  14. 95
  15. 14
  16. 97
  17. 78
  18. 64
  19. 34
  20. 45
  21. 63
  22. 98
  23. 57
  24. 44
  25. 49
  26. 74
  27. 52
  28. 67
  29. 25
  30. 75
  31. 93
  32. 48
  33. 52
  34. 134
  35. 37
  36. 92
  37. 116
  38. 90
  39. 13
  40. 98

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