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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 845 · 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 23 =
  2. 2.Half of 178 =
  3. 3.Double 36 =
  4. 4.Double 71 =
  5. 5.Double 81 =
  6. 6.Half of 174 =
  7. 7.Double 56 =
  8. 8.Double 38 =
  9. 9.Double 78 =
  10. 10.Half of 196 =
  11. 11.Half of 90 =
  12. 12.Half of 44 =
  13. 13.Double 49 =
  14. 14.Half of 160 =
  15. 15.Half of 118 =
  16. 16.Double 96 =
  17. 17.Double 22 =
  18. 18.Half of 92 =
  19. 19.Double 31 =
  20. 20.Double 63 =
  21. 21.Half of 52 =
  22. 22.Double 84 =
  23. 23.Half of 132 =
  24. 24.Half of 156 =
  25. 25.Double 98 =
  26. 26.Half of 36 =
  27. 27.Double 87 =
  28. 28.Double 95 =
  29. 29.Half of 54 =
  30. 30.Double 54 =
  31. 31.Half of 138 =
  32. 32.Half of 134 =
  33. 33.Half of 46 =
  34. 34.Half of 166 =
  35. 35.Half of 140 =
  36. 36.Double 91 =
  37. 37.Double 19 =
  38. 38.Double 99 =
  39. 39.Double 51 =
  40. 40.Double 25 =

Answer key

  1. 46
  2. 89
  3. 72
  4. 142
  5. 162
  6. 87
  7. 112
  8. 76
  9. 156
  10. 98
  11. 45
  12. 22
  13. 98
  14. 80
  15. 59
  16. 192
  17. 44
  18. 46
  19. 62
  20. 126
  21. 26
  22. 168
  23. 66
  24. 78
  25. 196
  26. 18
  27. 174
  28. 190
  29. 27
  30. 108
  31. 69
  32. 67
  33. 23
  34. 83
  35. 70
  36. 182
  37. 38
  38. 198
  39. 102
  40. 50

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