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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 861 · 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 21 =
  2. 2.Double 45 =
  3. 3.Half of 76 =
  4. 4.Double 99 =
  5. 5.Half of 66 =
  6. 6.Double 79 =
  7. 7.Double 81 =
  8. 8.Half of 150 =
  9. 9.Half of 38 =
  10. 10.Double 92 =
  11. 11.Double 26 =
  12. 12.Half of 184 =
  13. 13.Double 27 =
  14. 14.Half of 56 =
  15. 15.Double 62 =
  16. 16.Half of 196 =
  17. 17.Double 72 =
  18. 18.Double 91 =
  19. 19.Double 56 =
  20. 20.Double 16 =
  21. 21.Half of 148 =
  22. 22.Half of 58 =
  23. 23.Half of 26 =
  24. 24.Half of 192 =
  25. 25.Half of 186 =
  26. 26.Double 74 =
  27. 27.Double 94 =
  28. 28.Double 84 =
  29. 29.Half of 176 =
  30. 30.Half of 160 =
  31. 31.Half of 166 =
  32. 32.Half of 78 =
  33. 33.Double 38 =
  34. 34.Double 54 =
  35. 35.Double 73 =
  36. 36.Double 37 =
  37. 37.Half of 168 =
  38. 38.Double 96 =
  39. 39.Half of 120 =
  40. 40.Double 19 =

Answer key

  1. 42
  2. 90
  3. 38
  4. 198
  5. 33
  6. 158
  7. 162
  8. 75
  9. 19
  10. 184
  11. 52
  12. 92
  13. 54
  14. 28
  15. 124
  16. 98
  17. 144
  18. 182
  19. 112
  20. 32
  21. 74
  22. 29
  23. 13
  24. 96
  25. 93
  26. 148
  27. 188
  28. 168
  29. 88
  30. 80
  31. 83
  32. 39
  33. 76
  34. 108
  35. 146
  36. 74
  37. 84
  38. 192
  39. 60
  40. 38

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