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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 439 · 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 104 =
  2. 2.Half of 184 =
  3. 3.Half of 120 =
  4. 4.Double 22 =
  5. 5.Half of 186 =
  6. 6.Double 52 =
  7. 7.Double 28 =
  8. 8.Half of 188 =
  9. 9.Double 35 =
  10. 10.Half of 78 =
  11. 11.Half of 138 =
  12. 12.Double 34 =
  13. 13.Half of 156 =
  14. 14.Double 42 =
  15. 15.Double 99 =
  16. 16.Half of 190 =
  17. 17.Double 56 =
  18. 18.Double 58 =
  19. 19.Double 86 =
  20. 20.Double 17 =
  21. 21.Half of 198 =
  22. 22.Double 85 =
  23. 23.Double 62 =
  24. 24.Half of 68 =
  25. 25.Double 95 =
  26. 26.Double 19 =
  27. 27.Double 29 =
  28. 28.Half of 58 =
  29. 29.Double 64 =
  30. 30.Half of 116 =
  31. 31.Half of 132 =
  32. 32.Double 27 =
  33. 33.Double 31 =
  34. 34.Double 44 =
  35. 35.Double 59 =
  36. 36.Half of 126 =
  37. 37.Double 21 =
  38. 38.Half of 88 =
  39. 39.Half of 46 =
  40. 40.Double 43 =

Answer key

  1. 52
  2. 92
  3. 60
  4. 44
  5. 93
  6. 104
  7. 56
  8. 94
  9. 70
  10. 39
  11. 69
  12. 68
  13. 78
  14. 84
  15. 198
  16. 95
  17. 112
  18. 116
  19. 172
  20. 34
  21. 99
  22. 170
  23. 124
  24. 34
  25. 190
  26. 38
  27. 58
  28. 29
  29. 128
  30. 58
  31. 66
  32. 54
  33. 62
  34. 88
  35. 118
  36. 63
  37. 42
  38. 44
  39. 23
  40. 86

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