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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 995 · 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 106 =
  2. 2.Double 16 =
  3. 3.Double 32 =
  4. 4.Double 62 =
  5. 5.Half of 174 =
  6. 6.Half of 156 =
  7. 7.Double 87 =
  8. 8.Half of 160 =
  9. 9.Double 94 =
  10. 10.Double 77 =
  11. 11.Double 61 =
  12. 12.Half of 170 =
  13. 13.Half of 82 =
  14. 14.Half of 178 =
  15. 15.Double 22 =
  16. 16.Double 21 =
  17. 17.Double 59 =
  18. 18.Double 36 =
  19. 19.Half of 154 =
  20. 20.Double 54 =
  21. 21.Half of 182 =
  22. 22.Half of 162 =
  23. 23.Double 75 =
  24. 24.Half of 38 =
  25. 25.Half of 176 =
  26. 26.Half of 114 =
  27. 27.Half of 142 =
  28. 28.Double 97 =
  29. 29.Double 24 =
  30. 30.Half of 80 =
  31. 31.Double 79 =
  32. 32.Double 88 =
  33. 33.Half of 68 =
  34. 34.Half of 36 =
  35. 35.Double 78 =
  36. 36.Double 93 =
  37. 37.Double 58 =
  38. 38.Double 71 =
  39. 39.Half of 52 =
  40. 40.Double 52 =

Answer key

  1. 53
  2. 32
  3. 64
  4. 124
  5. 87
  6. 78
  7. 174
  8. 80
  9. 188
  10. 154
  11. 122
  12. 85
  13. 41
  14. 89
  15. 44
  16. 42
  17. 118
  18. 72
  19. 77
  20. 108
  21. 91
  22. 81
  23. 150
  24. 19
  25. 88
  26. 57
  27. 71
  28. 194
  29. 48
  30. 40
  31. 158
  32. 176
  33. 34
  34. 18
  35. 156
  36. 186
  37. 116
  38. 142
  39. 26
  40. 104

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