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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 939 · 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 194 =
  2. 2.Double 21 =
  3. 3.Double 29 =
  4. 4.Double 92 =
  5. 5.Double 37 =
  6. 6.Half of 80 =
  7. 7.Double 48 =
  8. 8.Half of 198 =
  9. 9.Double 71 =
  10. 10.Half of 162 =
  11. 11.Double 81 =
  12. 12.Double 82 =
  13. 13.Half of 154 =
  14. 14.Half of 140 =
  15. 15.Half of 112 =
  16. 16.Double 91 =
  17. 17.Double 87 =
  18. 18.Double 51 =
  19. 19.Half of 58 =
  20. 20.Double 99 =
  21. 21.Half of 44 =
  22. 22.Double 26 =
  23. 23.Half of 152 =
  24. 24.Double 59 =
  25. 25.Half of 114 =
  26. 26.Double 55 =
  27. 27.Half of 124 =
  28. 28.Half of 142 =
  29. 29.Half of 30 =
  30. 30.Half of 42 =
  31. 31.Double 43 =
  32. 32.Half of 158 =
  33. 33.Double 23 =
  34. 34.Double 77 =
  35. 35.Half of 150 =
  36. 36.Half of 32 =
  37. 37.Double 24 =
  38. 38.Half of 188 =
  39. 39.Double 95 =
  40. 40.Half of 26 =

Answer key

  1. 97
  2. 42
  3. 58
  4. 184
  5. 74
  6. 40
  7. 96
  8. 99
  9. 142
  10. 81
  11. 162
  12. 164
  13. 77
  14. 70
  15. 56
  16. 182
  17. 174
  18. 102
  19. 29
  20. 198
  21. 22
  22. 52
  23. 76
  24. 118
  25. 57
  26. 110
  27. 62
  28. 71
  29. 15
  30. 21
  31. 86
  32. 79
  33. 46
  34. 154
  35. 75
  36. 16
  37. 48
  38. 94
  39. 190
  40. 13

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