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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 607 · 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 76 =
  2. 2.Double 36 =
  3. 3.Double 27 =
  4. 4.Double 41 =
  5. 5.Double 56 =
  6. 6.Half of 38 =
  7. 7.Double 82 =
  8. 8.Half of 188 =
  9. 9.Double 61 =
  10. 10.Half of 128 =
  11. 11.Half of 144 =
  12. 12.Double 17 =
  13. 13.Double 48 =
  14. 14.Half of 30 =
  15. 15.Double 19 =
  16. 16.Double 91 =
  17. 17.Double 74 =
  18. 18.Double 39 =
  19. 19.Half of 60 =
  20. 20.Double 73 =
  21. 21.Double 97 =
  22. 22.Half of 102 =
  23. 23.Half of 190 =
  24. 24.Half of 70 =
  25. 25.Double 79 =
  26. 26.Double 64 =
  27. 27.Half of 62 =
  28. 28.Double 31 =
  29. 29.Half of 126 =
  30. 30.Double 54 =
  31. 31.Double 18 =
  32. 32.Double 33 =
  33. 33.Half of 32 =
  34. 34.Half of 98 =
  35. 35.Half of 108 =
  36. 36.Half of 154 =
  37. 37.Half of 56 =
  38. 38.Double 88 =
  39. 39.Double 46 =
  40. 40.Double 43 =

Answer key

  1. 38
  2. 72
  3. 54
  4. 82
  5. 112
  6. 19
  7. 164
  8. 94
  9. 122
  10. 64
  11. 72
  12. 34
  13. 96
  14. 15
  15. 38
  16. 182
  17. 148
  18. 78
  19. 30
  20. 146
  21. 194
  22. 51
  23. 95
  24. 35
  25. 158
  26. 128
  27. 31
  28. 62
  29. 63
  30. 108
  31. 36
  32. 66
  33. 16
  34. 49
  35. 54
  36. 77
  37. 28
  38. 176
  39. 92
  40. 86

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