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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 988 · 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 50 =
  2. 2.Half of 130 =
  3. 3.Half of 188 =
  4. 4.Half of 172 =
  5. 5.Double 91 =
  6. 6.Double 53 =
  7. 7.Double 96 =
  8. 8.Half of 34 =
  9. 9.Double 37 =
  10. 10.Half of 180 =
  11. 11.Double 65 =
  12. 12.Half of 114 =
  13. 13.Double 81 =
  14. 14.Half of 54 =
  15. 15.Half of 120 =
  16. 16.Half of 160 =
  17. 17.Double 19 =
  18. 18.Double 95 =
  19. 19.Half of 142 =
  20. 20.Half of 182 =
  21. 21.Half of 74 =
  22. 22.Half of 178 =
  23. 23.Half of 162 =
  24. 24.Half of 62 =
  25. 25.Half of 40 =
  26. 26.Double 25 =
  27. 27.Double 49 =
  28. 28.Double 86 =
  29. 29.Double 35 =
  30. 30.Half of 70 =
  31. 31.Half of 140 =
  32. 32.Double 18 =
  33. 33.Double 58 =
  34. 34.Half of 82 =
  35. 35.Half of 46 =
  36. 36.Half of 56 =
  37. 37.Half of 98 =
  38. 38.Double 32 =
  39. 39.Half of 102 =
  40. 40.Half of 154 =

Answer key

  1. 25
  2. 65
  3. 94
  4. 86
  5. 182
  6. 106
  7. 192
  8. 17
  9. 74
  10. 90
  11. 130
  12. 57
  13. 162
  14. 27
  15. 60
  16. 80
  17. 38
  18. 190
  19. 71
  20. 91
  21. 37
  22. 89
  23. 81
  24. 31
  25. 20
  26. 50
  27. 98
  28. 172
  29. 70
  30. 35
  31. 70
  32. 36
  33. 116
  34. 41
  35. 23
  36. 28
  37. 49
  38. 64
  39. 51
  40. 77

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