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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 558 · 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 188 =
  2. 2.Double 73 =
  3. 3.Half of 166 =
  4. 4.Half of 194 =
  5. 5.Double 77 =
  6. 6.Double 22 =
  7. 7.Half of 104 =
  8. 8.Double 49 =
  9. 9.Half of 80 =
  10. 10.Half of 170 =
  11. 11.Double 85 =
  12. 12.Half of 148 =
  13. 13.Double 48 =
  14. 14.Half of 112 =
  15. 15.Double 33 =
  16. 16.Double 29 =
  17. 17.Half of 58 =
  18. 18.Double 44 =
  19. 19.Half of 86 =
  20. 20.Half of 94 =
  21. 21.Double 16 =
  22. 22.Half of 90 =
  23. 23.Half of 26 =
  24. 24.Half of 28 =
  25. 25.Double 88 =
  26. 26.Double 38 =
  27. 27.Double 91 =
  28. 28.Double 63 =
  29. 29.Half of 144 =
  30. 30.Double 86 =
  31. 31.Double 26 =
  32. 32.Double 17 =
  33. 33.Half of 42 =
  34. 34.Half of 120 =
  35. 35.Double 89 =
  36. 36.Half of 130 =
  37. 37.Half of 168 =
  38. 38.Double 54 =
  39. 39.Double 69 =
  40. 40.Double 23 =

Answer key

  1. 94
  2. 146
  3. 83
  4. 97
  5. 154
  6. 44
  7. 52
  8. 98
  9. 40
  10. 85
  11. 170
  12. 74
  13. 96
  14. 56
  15. 66
  16. 58
  17. 29
  18. 88
  19. 43
  20. 47
  21. 32
  22. 45
  23. 13
  24. 14
  25. 176
  26. 76
  27. 182
  28. 126
  29. 72
  30. 172
  31. 52
  32. 34
  33. 21
  34. 60
  35. 178
  36. 65
  37. 84
  38. 108
  39. 138
  40. 46

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