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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 891 · 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.Double 75 =
  3. 3.Half of 72 =
  4. 4.Double 62 =
  5. 5.Half of 50 =
  6. 6.Double 95 =
  7. 7.Half of 86 =
  8. 8.Half of 170 =
  9. 9.Half of 68 =
  10. 10.Half of 32 =
  11. 11.Half of 174 =
  12. 12.Double 81 =
  13. 13.Double 28 =
  14. 14.Double 91 =
  15. 15.Half of 150 =
  16. 16.Double 76 =
  17. 17.Double 43 =
  18. 18.Half of 154 =
  19. 19.Half of 144 =
  20. 20.Double 23 =
  21. 21.Half of 56 =
  22. 22.Half of 112 =
  23. 23.Double 58 =
  24. 24.Double 26 =
  25. 25.Double 96 =
  26. 26.Half of 100 =
  27. 27.Double 34 =
  28. 28.Double 22 =
  29. 29.Double 83 =
  30. 30.Half of 120 =
  31. 31.Double 19 =
  32. 32.Double 86 =
  33. 33.Double 16 =
  34. 34.Half of 114 =
  35. 35.Half of 178 =
  36. 36.Half of 142 =
  37. 37.Double 69 =
  38. 38.Double 49 =
  39. 39.Double 87 =
  40. 40.Half of 66 =

Answer key

  1. 81
  2. 150
  3. 36
  4. 124
  5. 25
  6. 190
  7. 43
  8. 85
  9. 34
  10. 16
  11. 87
  12. 162
  13. 56
  14. 182
  15. 75
  16. 152
  17. 86
  18. 77
  19. 72
  20. 46
  21. 28
  22. 56
  23. 116
  24. 52
  25. 192
  26. 50
  27. 68
  28. 44
  29. 166
  30. 60
  31. 38
  32. 172
  33. 32
  34. 57
  35. 89
  36. 71
  37. 138
  38. 98
  39. 174
  40. 33

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