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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 854 · 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 65 =
  2. 2.Double 27 =
  3. 3.Double 51 =
  4. 4.Half of 118 =
  5. 5.Half of 120 =
  6. 6.Double 71 =
  7. 7.Double 67 =
  8. 8.Half of 140 =
  9. 9.Double 55 =
  10. 10.Half of 42 =
  11. 11.Double 97 =
  12. 12.Double 47 =
  13. 13.Half of 176 =
  14. 14.Double 21 =
  15. 15.Double 31 =
  16. 16.Half of 102 =
  17. 17.Half of 26 =
  18. 18.Half of 66 =
  19. 19.Double 99 =
  20. 20.Double 25 =
  21. 21.Double 49 =
  22. 22.Half of 170 =
  23. 23.Half of 84 =
  24. 24.Half of 52 =
  25. 25.Double 93 =
  26. 26.Double 32 =
  27. 27.Double 95 =
  28. 28.Double 91 =
  29. 29.Double 96 =
  30. 30.Double 63 =
  31. 31.Double 81 =
  32. 32.Half of 100 =
  33. 33.Double 52 =
  34. 34.Double 38 =
  35. 35.Half of 58 =
  36. 36.Half of 56 =
  37. 37.Half of 76 =
  38. 38.Half of 182 =
  39. 39.Half of 184 =
  40. 40.Half of 160 =

Answer key

  1. 130
  2. 54
  3. 102
  4. 59
  5. 60
  6. 142
  7. 134
  8. 70
  9. 110
  10. 21
  11. 194
  12. 94
  13. 88
  14. 42
  15. 62
  16. 51
  17. 13
  18. 33
  19. 198
  20. 50
  21. 98
  22. 85
  23. 42
  24. 26
  25. 186
  26. 64
  27. 190
  28. 182
  29. 192
  30. 126
  31. 162
  32. 50
  33. 104
  34. 76
  35. 29
  36. 28
  37. 38
  38. 91
  39. 92
  40. 80

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