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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 890 · 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 184 =
  2. 2.Double 71 =
  3. 3.Double 62 =
  4. 4.Double 43 =
  5. 5.Half of 122 =
  6. 6.Double 93 =
  7. 7.Double 17 =
  8. 8.Double 88 =
  9. 9.Double 72 =
  10. 10.Half of 46 =
  11. 11.Half of 38 =
  12. 12.Half of 90 =
  13. 13.Half of 164 =
  14. 14.Half of 188 =
  15. 15.Half of 34 =
  16. 16.Half of 180 =
  17. 17.Half of 152 =
  18. 18.Double 97 =
  19. 19.Double 33 =
  20. 20.Double 29 =
  21. 21.Half of 158 =
  22. 22.Half of 62 =
  23. 23.Double 32 =
  24. 24.Half of 194 =
  25. 25.Double 42 =
  26. 26.Double 65 =
  27. 27.Half of 156 =
  28. 28.Half of 80 =
  29. 29.Half of 166 =
  30. 30.Double 38 =
  31. 31.Half of 148 =
  32. 32.Double 39 =
  33. 33.Half of 44 =
  34. 34.Double 74 =
  35. 35.Half of 124 =
  36. 36.Double 82 =
  37. 37.Double 78 =
  38. 38.Double 91 =
  39. 39.Double 68 =
  40. 40.Half of 114 =

Answer key

  1. 92
  2. 142
  3. 124
  4. 86
  5. 61
  6. 186
  7. 34
  8. 176
  9. 144
  10. 23
  11. 19
  12. 45
  13. 82
  14. 94
  15. 17
  16. 90
  17. 76
  18. 194
  19. 66
  20. 58
  21. 79
  22. 31
  23. 64
  24. 97
  25. 84
  26. 130
  27. 78
  28. 40
  29. 83
  30. 76
  31. 74
  32. 78
  33. 22
  34. 148
  35. 62
  36. 164
  37. 156
  38. 182
  39. 136
  40. 57

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