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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 958 · 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 27 =
  2. 2.Double 19 =
  3. 3.Half of 72 =
  4. 4.Double 48 =
  5. 5.Double 44 =
  6. 6.Double 94 =
  7. 7.Double 95 =
  8. 8.Double 17 =
  9. 9.Double 81 =
  10. 10.Half of 168 =
  11. 11.Half of 154 =
  12. 12.Double 45 =
  13. 13.Half of 144 =
  14. 14.Half of 62 =
  15. 15.Half of 184 =
  16. 16.Half of 70 =
  17. 17.Double 36 =
  18. 18.Double 62 =
  19. 19.Half of 190 =
  20. 20.Half of 122 =
  21. 21.Double 97 =
  22. 22.Half of 56 =
  23. 23.Half of 58 =
  24. 24.Double 88 =
  25. 25.Half of 60 =
  26. 26.Half of 30 =
  27. 27.Half of 124 =
  28. 28.Double 42 =
  29. 29.Half of 156 =
  30. 30.Half of 64 =
  31. 31.Double 21 =
  32. 32.Double 37 =
  33. 33.Double 53 =
  34. 34.Half of 46 =
  35. 35.Half of 186 =
  36. 36.Half of 146 =
  37. 37.Half of 116 =
  38. 38.Half of 174 =
  39. 39.Half of 108 =
  40. 40.Half of 96 =

Answer key

  1. 54
  2. 38
  3. 36
  4. 96
  5. 88
  6. 188
  7. 190
  8. 34
  9. 162
  10. 84
  11. 77
  12. 90
  13. 72
  14. 31
  15. 92
  16. 35
  17. 72
  18. 124
  19. 95
  20. 61
  21. 194
  22. 28
  23. 29
  24. 176
  25. 30
  26. 15
  27. 62
  28. 84
  29. 78
  30. 32
  31. 42
  32. 74
  33. 106
  34. 23
  35. 93
  36. 73
  37. 58
  38. 87
  39. 54
  40. 48

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