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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 937 · 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 174 =
  2. 2.Double 27 =
  3. 3.Double 81 =
  4. 4.Half of 42 =
  5. 5.Half of 186 =
  6. 6.Half of 160 =
  7. 7.Double 67 =
  8. 8.Double 61 =
  9. 9.Double 37 =
  10. 10.Double 71 =
  11. 11.Half of 114 =
  12. 12.Double 72 =
  13. 13.Half of 112 =
  14. 14.Half of 144 =
  15. 15.Double 86 =
  16. 16.Double 43 =
  17. 17.Double 66 =
  18. 18.Double 18 =
  19. 19.Double 75 =
  20. 20.Half of 196 =
  21. 21.Double 88 =
  22. 22.Double 24 =
  23. 23.Half of 86 =
  24. 24.Half of 116 =
  25. 25.Double 48 =
  26. 26.Half of 126 =
  27. 27.Double 35 =
  28. 28.Double 19 =
  29. 29.Double 53 =
  30. 30.Double 41 =
  31. 31.Half of 88 =
  32. 32.Half of 124 =
  33. 33.Double 21 =
  34. 34.Double 89 =
  35. 35.Half of 156 =
  36. 36.Half of 34 =
  37. 37.Double 62 =
  38. 38.Double 55 =
  39. 39.Half of 32 =
  40. 40.Double 79 =

Answer key

  1. 87
  2. 54
  3. 162
  4. 21
  5. 93
  6. 80
  7. 134
  8. 122
  9. 74
  10. 142
  11. 57
  12. 144
  13. 56
  14. 72
  15. 172
  16. 86
  17. 132
  18. 36
  19. 150
  20. 98
  21. 176
  22. 48
  23. 43
  24. 58
  25. 96
  26. 63
  27. 70
  28. 38
  29. 106
  30. 82
  31. 44
  32. 62
  33. 42
  34. 178
  35. 78
  36. 17
  37. 124
  38. 110
  39. 16
  40. 158

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