← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 270 · 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 92 =
  2. 2.Half of 184 =
  3. 3.Double 38 =
  4. 4.Double 42 =
  5. 5.Half of 72 =
  6. 6.Half of 118 =
  7. 7.Half of 158 =
  8. 8.Double 55 =
  9. 9.Double 84 =
  10. 10.Double 35 =
  11. 11.Double 56 =
  12. 12.Half of 106 =
  13. 13.Half of 44 =
  14. 14.Half of 32 =
  15. 15.Half of 182 =
  16. 16.Double 75 =
  17. 17.Half of 36 =
  18. 18.Half of 48 =
  19. 19.Half of 170 =
  20. 20.Half of 132 =
  21. 21.Double 63 =
  22. 22.Half of 54 =
  23. 23.Half of 164 =
  24. 24.Double 72 =
  25. 25.Half of 128 =
  26. 26.Double 31 =
  27. 27.Half of 172 =
  28. 28.Half of 90 =
  29. 29.Half of 52 =
  30. 30.Half of 30 =
  31. 31.Half of 78 =
  32. 32.Half of 70 =
  33. 33.Half of 190 =
  34. 34.Double 23 =
  35. 35.Half of 104 =
  36. 36.Double 79 =
  37. 37.Double 25 =
  38. 38.Double 22 =
  39. 39.Double 85 =
  40. 40.Double 18 =

Answer key

  1. 46
  2. 92
  3. 76
  4. 84
  5. 36
  6. 59
  7. 79
  8. 110
  9. 168
  10. 70
  11. 112
  12. 53
  13. 22
  14. 16
  15. 91
  16. 150
  17. 18
  18. 24
  19. 85
  20. 66
  21. 126
  22. 27
  23. 82
  24. 144
  25. 64
  26. 62
  27. 86
  28. 45
  29. 26
  30. 15
  31. 39
  32. 35
  33. 95
  34. 46
  35. 52
  36. 158
  37. 50
  38. 44
  39. 170
  40. 36

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths