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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 917 · 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 64 =
  2. 2.Double 23 =
  3. 3.Half of 142 =
  4. 4.Double 18 =
  5. 5.Half of 110 =
  6. 6.Half of 70 =
  7. 7.Double 91 =
  8. 8.Double 86 =
  9. 9.Half of 160 =
  10. 10.Double 74 =
  11. 11.Half of 170 =
  12. 12.Half of 88 =
  13. 13.Double 17 =
  14. 14.Half of 32 =
  15. 15.Double 41 =
  16. 16.Half of 92 =
  17. 17.Double 36 =
  18. 18.Double 99 =
  19. 19.Double 81 =
  20. 20.Half of 188 =
  21. 21.Double 29 =
  22. 22.Half of 198 =
  23. 23.Half of 28 =
  24. 24.Double 19 =
  25. 25.Double 25 =
  26. 26.Double 77 =
  27. 27.Double 55 =
  28. 28.Half of 36 =
  29. 29.Half of 132 =
  30. 30.Double 57 =
  31. 31.Double 61 =
  32. 32.Double 35 =
  33. 33.Half of 162 =
  34. 34.Double 27 =
  35. 35.Half of 30 =
  36. 36.Double 37 =
  37. 37.Double 45 =
  38. 38.Double 96 =
  39. 39.Double 21 =
  40. 40.Double 89 =

Answer key

  1. 128
  2. 46
  3. 71
  4. 36
  5. 55
  6. 35
  7. 182
  8. 172
  9. 80
  10. 148
  11. 85
  12. 44
  13. 34
  14. 16
  15. 82
  16. 46
  17. 72
  18. 198
  19. 162
  20. 94
  21. 58
  22. 99
  23. 14
  24. 38
  25. 50
  26. 154
  27. 110
  28. 18
  29. 66
  30. 114
  31. 122
  32. 70
  33. 81
  34. 54
  35. 15
  36. 74
  37. 90
  38. 192
  39. 42
  40. 178

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