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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 950 · 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 46 =
  2. 2.Double 49 =
  3. 3.Half of 64 =
  4. 4.Double 79 =
  5. 5.Double 22 =
  6. 6.Double 57 =
  7. 7.Half of 180 =
  8. 8.Double 19 =
  9. 9.Half of 164 =
  10. 10.Double 42 =
  11. 11.Double 84 =
  12. 12.Double 21 =
  13. 13.Half of 50 =
  14. 14.Half of 144 =
  15. 15.Double 26 =
  16. 16.Double 75 =
  17. 17.Double 51 =
  18. 18.Double 44 =
  19. 19.Half of 66 =
  20. 20.Half of 44 =
  21. 21.Double 81 =
  22. 22.Double 89 =
  23. 23.Half of 112 =
  24. 24.Half of 56 =
  25. 25.Half of 92 =
  26. 26.Double 24 =
  27. 27.Half of 78 =
  28. 28.Double 34 =
  29. 29.Double 92 =
  30. 30.Half of 190 =
  31. 31.Half of 42 =
  32. 32.Half of 166 =
  33. 33.Double 35 =
  34. 34.Half of 110 =
  35. 35.Double 29 =
  36. 36.Double 23 =
  37. 37.Half of 102 =
  38. 38.Half of 38 =
  39. 39.Half of 94 =
  40. 40.Half of 90 =

Answer key

  1. 92
  2. 98
  3. 32
  4. 158
  5. 44
  6. 114
  7. 90
  8. 38
  9. 82
  10. 84
  11. 168
  12. 42
  13. 25
  14. 72
  15. 52
  16. 150
  17. 102
  18. 88
  19. 33
  20. 22
  21. 162
  22. 178
  23. 56
  24. 28
  25. 46
  26. 48
  27. 39
  28. 68
  29. 184
  30. 95
  31. 21
  32. 83
  33. 70
  34. 55
  35. 58
  36. 46
  37. 51
  38. 19
  39. 47
  40. 45

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