← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 10 · 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 144 =
  2. 2.Double 27 =
  3. 3.Double 51 =
  4. 4.Double 24 =
  5. 5.Double 26 =
  6. 6.Half of 120 =
  7. 7.Double 91 =
  8. 8.Half of 136 =
  9. 9.Double 42 =
  10. 10.Double 83 =
  11. 11.Half of 168 =
  12. 12.Double 45 =
  13. 13.Double 98 =
  14. 14.Half of 34 =
  15. 15.Double 35 =
  16. 16.Double 97 =
  17. 17.Half of 186 =
  18. 18.Half of 88 =
  19. 19.Half of 172 =
  20. 20.Double 49 =
  21. 21.Double 25 =
  22. 22.Double 76 =
  23. 23.Double 18 =
  24. 24.Half of 40 =
  25. 25.Half of 176 =
  26. 26.Double 65 =
  27. 27.Half of 76 =
  28. 28.Double 81 =
  29. 29.Double 54 =
  30. 30.Half of 74 =
  31. 31.Half of 62 =
  32. 32.Double 62 =
  33. 33.Double 53 =
  34. 34.Double 31 =
  35. 35.Half of 104 =
  36. 36.Double 96 =
  37. 37.Double 67 =
  38. 38.Double 61 =
  39. 39.Double 58 =
  40. 40.Half of 118 =

Answer key

  1. 72
  2. 54
  3. 102
  4. 48
  5. 52
  6. 60
  7. 182
  8. 68
  9. 84
  10. 166
  11. 84
  12. 90
  13. 196
  14. 17
  15. 70
  16. 194
  17. 93
  18. 44
  19. 86
  20. 98
  21. 50
  22. 152
  23. 36
  24. 20
  25. 88
  26. 130
  27. 38
  28. 162
  29. 108
  30. 37
  31. 31
  32. 124
  33. 106
  34. 62
  35. 52
  36. 192
  37. 134
  38. 122
  39. 116
  40. 59

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