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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 628 · 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.Half of 168 =
  3. 3.Half of 154 =
  4. 4.Double 54 =
  5. 5.Double 96 =
  6. 6.Half of 84 =
  7. 7.Half of 190 =
  8. 8.Double 37 =
  9. 9.Half of 106 =
  10. 10.Half of 72 =
  11. 11.Half of 34 =
  12. 12.Half of 38 =
  13. 13.Double 49 =
  14. 14.Half of 90 =
  15. 15.Half of 94 =
  16. 16.Half of 30 =
  17. 17.Half of 170 =
  18. 18.Double 35 =
  19. 19.Half of 64 =
  20. 20.Double 65 =
  21. 21.Double 88 =
  22. 22.Double 18 =
  23. 23.Double 27 =
  24. 24.Half of 166 =
  25. 25.Half of 62 =
  26. 26.Half of 36 =
  27. 27.Half of 124 =
  28. 28.Double 39 =
  29. 29.Double 77 =
  30. 30.Half of 102 =
  31. 31.Half of 48 =
  32. 32.Half of 114 =
  33. 33.Half of 108 =
  34. 34.Double 83 =
  35. 35.Double 42 =
  36. 36.Double 59 =
  37. 37.Half of 32 =
  38. 38.Double 91 =
  39. 39.Half of 118 =
  40. 40.Double 36 =

Answer key

  1. 42
  2. 84
  3. 77
  4. 108
  5. 192
  6. 42
  7. 95
  8. 74
  9. 53
  10. 36
  11. 17
  12. 19
  13. 98
  14. 45
  15. 47
  16. 15
  17. 85
  18. 70
  19. 32
  20. 130
  21. 176
  22. 36
  23. 54
  24. 83
  25. 31
  26. 18
  27. 62
  28. 78
  29. 154
  30. 51
  31. 24
  32. 57
  33. 54
  34. 166
  35. 84
  36. 118
  37. 16
  38. 182
  39. 59
  40. 72

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