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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 911 · 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 36 =
  2. 2.Double 77 =
  3. 3.Half of 60 =
  4. 4.Half of 174 =
  5. 5.Double 87 =
  6. 6.Half of 78 =
  7. 7.Half of 122 =
  8. 8.Double 67 =
  9. 9.Half of 30 =
  10. 10.Double 48 =
  11. 11.Double 31 =
  12. 12.Double 88 =
  13. 13.Double 82 =
  14. 14.Double 39 =
  15. 15.Half of 148 =
  16. 16.Double 27 =
  17. 17.Double 79 =
  18. 18.Half of 192 =
  19. 19.Double 68 =
  20. 20.Half of 36 =
  21. 21.Half of 34 =
  22. 22.Double 98 =
  23. 23.Double 23 =
  24. 24.Double 38 =
  25. 25.Half of 190 =
  26. 26.Half of 58 =
  27. 27.Half of 132 =
  28. 28.Double 83 =
  29. 29.Double 85 =
  30. 30.Half of 138 =
  31. 31.Double 64 =
  32. 32.Half of 166 =
  33. 33.Double 52 =
  34. 34.Double 34 =
  35. 35.Half of 154 =
  36. 36.Double 17 =
  37. 37.Double 32 =
  38. 38.Half of 130 =
  39. 39.Half of 102 =
  40. 40.Double 95 =

Answer key

  1. 72
  2. 154
  3. 30
  4. 87
  5. 174
  6. 39
  7. 61
  8. 134
  9. 15
  10. 96
  11. 62
  12. 176
  13. 164
  14. 78
  15. 74
  16. 54
  17. 158
  18. 96
  19. 136
  20. 18
  21. 17
  22. 196
  23. 46
  24. 76
  25. 95
  26. 29
  27. 66
  28. 166
  29. 170
  30. 69
  31. 128
  32. 83
  33. 104
  34. 68
  35. 77
  36. 34
  37. 64
  38. 65
  39. 51
  40. 190

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