← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 274 · 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 50 =
  2. 2.Half of 46 =
  3. 3.Double 35 =
  4. 4.Double 17 =
  5. 5.Double 79 =
  6. 6.Double 21 =
  7. 7.Half of 128 =
  8. 8.Double 46 =
  9. 9.Half of 100 =
  10. 10.Double 81 =
  11. 11.Double 68 =
  12. 12.Double 52 =
  13. 13.Double 85 =
  14. 14.Half of 54 =
  15. 15.Double 43 =
  16. 16.Double 66 =
  17. 17.Double 41 =
  18. 18.Half of 82 =
  19. 19.Half of 148 =
  20. 20.Half of 168 =
  21. 21.Double 31 =
  22. 22.Half of 142 =
  23. 23.Double 92 =
  24. 24.Half of 182 =
  25. 25.Half of 138 =
  26. 26.Half of 140 =
  27. 27.Half of 86 =
  28. 28.Half of 124 =
  29. 29.Half of 112 =
  30. 30.Double 67 =
  31. 31.Half of 184 =
  32. 32.Double 18 =
  33. 33.Double 91 =
  34. 34.Double 65 =
  35. 35.Double 16 =
  36. 36.Half of 40 =
  37. 37.Half of 186 =
  38. 38.Half of 194 =
  39. 39.Double 71 =
  40. 40.Half of 132 =

Answer key

  1. 25
  2. 23
  3. 70
  4. 34
  5. 158
  6. 42
  7. 64
  8. 92
  9. 50
  10. 162
  11. 136
  12. 104
  13. 170
  14. 27
  15. 86
  16. 132
  17. 82
  18. 41
  19. 74
  20. 84
  21. 62
  22. 71
  23. 184
  24. 91
  25. 69
  26. 70
  27. 43
  28. 62
  29. 56
  30. 134
  31. 92
  32. 36
  33. 182
  34. 130
  35. 32
  36. 20
  37. 93
  38. 97
  39. 142
  40. 66

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