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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 884 · 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 43 =
  2. 2.Double 57 =
  3. 3.Double 28 =
  4. 4.Double 22 =
  5. 5.Double 69 =
  6. 6.Double 41 =
  7. 7.Half of 124 =
  8. 8.Double 31 =
  9. 9.Half of 114 =
  10. 10.Half of 62 =
  11. 11.Double 76 =
  12. 12.Half of 58 =
  13. 13.Double 39 =
  14. 14.Double 21 =
  15. 15.Half of 100 =
  16. 16.Double 98 =
  17. 17.Half of 38 =
  18. 18.Half of 56 =
  19. 19.Double 44 =
  20. 20.Double 58 =
  21. 21.Double 67 =
  22. 22.Half of 130 =
  23. 23.Half of 136 =
  24. 24.Half of 34 =
  25. 25.Double 45 =
  26. 26.Half of 122 =
  27. 27.Half of 42 =
  28. 28.Half of 28 =
  29. 29.Double 38 =
  30. 30.Half of 72 =
  31. 31.Double 51 =
  32. 32.Half of 182 =
  33. 33.Double 89 =
  34. 34.Double 27 =
  35. 35.Half of 70 =
  36. 36.Double 26 =
  37. 37.Double 32 =
  38. 38.Double 63 =
  39. 39.Half of 154 =
  40. 40.Half of 142 =

Answer key

  1. 86
  2. 114
  3. 56
  4. 44
  5. 138
  6. 82
  7. 62
  8. 62
  9. 57
  10. 31
  11. 152
  12. 29
  13. 78
  14. 42
  15. 50
  16. 196
  17. 19
  18. 28
  19. 88
  20. 116
  21. 134
  22. 65
  23. 68
  24. 17
  25. 90
  26. 61
  27. 21
  28. 14
  29. 76
  30. 36
  31. 102
  32. 91
  33. 178
  34. 54
  35. 35
  36. 52
  37. 64
  38. 126
  39. 77
  40. 71

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