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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 943 · 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 144 =
  2. 2.Half of 32 =
  3. 3.Double 69 =
  4. 4.Half of 126 =
  5. 5.Half of 166 =
  6. 6.Double 41 =
  7. 7.Double 77 =
  8. 8.Half of 76 =
  9. 9.Half of 56 =
  10. 10.Double 93 =
  11. 11.Double 17 =
  12. 12.Double 44 =
  13. 13.Half of 62 =
  14. 14.Double 16 =
  15. 15.Half of 136 =
  16. 16.Half of 110 =
  17. 17.Half of 94 =
  18. 18.Double 94 =
  19. 19.Half of 86 =
  20. 20.Double 82 =
  21. 21.Half of 118 =
  22. 22.Double 39 =
  23. 23.Half of 186 =
  24. 24.Double 51 =
  25. 25.Half of 78 =
  26. 26.Half of 184 =
  27. 27.Double 61 =
  28. 28.Double 31 =
  29. 29.Half of 100 =
  30. 30.Half of 30 =
  31. 31.Half of 112 =
  32. 32.Half of 26 =
  33. 33.Half of 130 =
  34. 34.Half of 48 =
  35. 35.Half of 142 =
  36. 36.Double 33 =
  37. 37.Half of 74 =
  38. 38.Half of 162 =
  39. 39.Double 79 =
  40. 40.Half of 178 =

Answer key

  1. 72
  2. 16
  3. 138
  4. 63
  5. 83
  6. 82
  7. 154
  8. 38
  9. 28
  10. 186
  11. 34
  12. 88
  13. 31
  14. 32
  15. 68
  16. 55
  17. 47
  18. 188
  19. 43
  20. 164
  21. 59
  22. 78
  23. 93
  24. 102
  25. 39
  26. 92
  27. 122
  28. 62
  29. 50
  30. 15
  31. 56
  32. 13
  33. 65
  34. 24
  35. 71
  36. 66
  37. 37
  38. 81
  39. 158
  40. 89

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