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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 868 · 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 162 =
  2. 2.Half of 80 =
  3. 3.Half of 74 =
  4. 4.Double 93 =
  5. 5.Double 79 =
  6. 6.Double 34 =
  7. 7.Half of 50 =
  8. 8.Double 71 =
  9. 9.Double 65 =
  10. 10.Half of 52 =
  11. 11.Double 48 =
  12. 12.Double 36 =
  13. 13.Double 43 =
  14. 14.Double 89 =
  15. 15.Double 78 =
  16. 16.Double 23 =
  17. 17.Half of 30 =
  18. 18.Double 97 =
  19. 19.Double 22 =
  20. 20.Half of 156 =
  21. 21.Double 17 =
  22. 22.Half of 164 =
  23. 23.Half of 178 =
  24. 24.Double 86 =
  25. 25.Half of 150 =
  26. 26.Double 83 =
  27. 27.Half of 48 =
  28. 28.Half of 84 =
  29. 29.Half of 168 =
  30. 30.Double 98 =
  31. 31.Half of 122 =
  32. 32.Double 88 =
  33. 33.Double 95 =
  34. 34.Half of 94 =
  35. 35.Half of 40 =
  36. 36.Half of 38 =
  37. 37.Double 55 =
  38. 38.Half of 26 =
  39. 39.Double 28 =
  40. 40.Half of 144 =

Answer key

  1. 81
  2. 40
  3. 37
  4. 186
  5. 158
  6. 68
  7. 25
  8. 142
  9. 130
  10. 26
  11. 96
  12. 72
  13. 86
  14. 178
  15. 156
  16. 46
  17. 15
  18. 194
  19. 44
  20. 78
  21. 34
  22. 82
  23. 89
  24. 172
  25. 75
  26. 166
  27. 24
  28. 42
  29. 84
  30. 196
  31. 61
  32. 176
  33. 190
  34. 47
  35. 20
  36. 19
  37. 110
  38. 13
  39. 56
  40. 72

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