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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 899 · 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 26 =
  2. 2.Double 16 =
  3. 3.Half of 140 =
  4. 4.Double 71 =
  5. 5.Half of 134 =
  6. 6.Half of 30 =
  7. 7.Half of 172 =
  8. 8.Double 98 =
  9. 9.Half of 170 =
  10. 10.Double 73 =
  11. 11.Double 57 =
  12. 12.Double 52 =
  13. 13.Double 58 =
  14. 14.Half of 156 =
  15. 15.Double 49 =
  16. 16.Half of 70 =
  17. 17.Double 34 =
  18. 18.Half of 124 =
  19. 19.Double 18 =
  20. 20.Double 47 =
  21. 21.Half of 120 =
  22. 22.Double 32 =
  23. 23.Double 97 =
  24. 24.Half of 108 =
  25. 25.Double 51 =
  26. 26.Half of 26 =
  27. 27.Half of 110 =
  28. 28.Double 95 =
  29. 29.Half of 122 =
  30. 30.Half of 94 =
  31. 31.Double 19 =
  32. 32.Half of 166 =
  33. 33.Double 65 =
  34. 34.Double 41 =
  35. 35.Half of 136 =
  36. 36.Double 35 =
  37. 37.Double 22 =
  38. 38.Half of 34 =
  39. 39.Double 25 =
  40. 40.Double 59 =

Answer key

  1. 52
  2. 32
  3. 70
  4. 142
  5. 67
  6. 15
  7. 86
  8. 196
  9. 85
  10. 146
  11. 114
  12. 104
  13. 116
  14. 78
  15. 98
  16. 35
  17. 68
  18. 62
  19. 36
  20. 94
  21. 60
  22. 64
  23. 194
  24. 54
  25. 102
  26. 13
  27. 55
  28. 190
  29. 61
  30. 47
  31. 38
  32. 83
  33. 130
  34. 82
  35. 68
  36. 70
  37. 44
  38. 17
  39. 50
  40. 118

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