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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 967 · 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 87 =
  2. 2.Double 61 =
  3. 3.Half of 36 =
  4. 4.Double 92 =
  5. 5.Double 84 =
  6. 6.Double 48 =
  7. 7.Double 96 =
  8. 8.Double 42 =
  9. 9.Half of 50 =
  10. 10.Double 78 =
  11. 11.Half of 76 =
  12. 12.Double 24 =
  13. 13.Half of 42 =
  14. 14.Half of 194 =
  15. 15.Half of 108 =
  16. 16.Double 23 =
  17. 17.Double 43 =
  18. 18.Half of 192 =
  19. 19.Half of 60 =
  20. 20.Half of 198 =
  21. 21.Double 29 =
  22. 22.Half of 180 =
  23. 23.Half of 138 =
  24. 24.Double 19 =
  25. 25.Half of 78 =
  26. 26.Double 44 =
  27. 27.Double 69 =
  28. 28.Half of 46 =
  29. 29.Double 74 =
  30. 30.Half of 134 =
  31. 31.Half of 142 =
  32. 32.Half of 166 =
  33. 33.Half of 74 =
  34. 34.Half of 160 =
  35. 35.Double 34 =
  36. 36.Half of 34 =
  37. 37.Double 26 =
  38. 38.Double 21 =
  39. 39.Double 31 =
  40. 40.Double 49 =

Answer key

  1. 174
  2. 122
  3. 18
  4. 184
  5. 168
  6. 96
  7. 192
  8. 84
  9. 25
  10. 156
  11. 38
  12. 48
  13. 21
  14. 97
  15. 54
  16. 46
  17. 86
  18. 96
  19. 30
  20. 99
  21. 58
  22. 90
  23. 69
  24. 38
  25. 39
  26. 88
  27. 138
  28. 23
  29. 148
  30. 67
  31. 71
  32. 83
  33. 37
  34. 80
  35. 68
  36. 17
  37. 52
  38. 42
  39. 62
  40. 98

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