← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 976 · 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 90 =
  2. 2.Half of 148 =
  3. 3.Half of 114 =
  4. 4.Half of 68 =
  5. 5.Half of 72 =
  6. 6.Half of 122 =
  7. 7.Half of 46 =
  8. 8.Double 17 =
  9. 9.Double 72 =
  10. 10.Half of 142 =
  11. 11.Double 98 =
  12. 12.Double 27 =
  13. 13.Half of 106 =
  14. 14.Half of 190 =
  15. 15.Double 29 =
  16. 16.Half of 102 =
  17. 17.Half of 180 =
  18. 18.Half of 42 =
  19. 19.Double 41 =
  20. 20.Double 84 =
  21. 21.Double 77 =
  22. 22.Half of 196 =
  23. 23.Half of 176 =
  24. 24.Double 91 =
  25. 25.Half of 170 =
  26. 26.Half of 128 =
  27. 27.Double 73 =
  28. 28.Double 95 =
  29. 29.Double 65 =
  30. 30.Half of 80 =
  31. 31.Double 57 =
  32. 32.Double 97 =
  33. 33.Double 86 =
  34. 34.Double 69 =
  35. 35.Double 71 =
  36. 36.Half of 32 =
  37. 37.Half of 166 =
  38. 38.Half of 178 =
  39. 39.Double 85 =
  40. 40.Half of 94 =

Answer key

  1. 45
  2. 74
  3. 57
  4. 34
  5. 36
  6. 61
  7. 23
  8. 34
  9. 144
  10. 71
  11. 196
  12. 54
  13. 53
  14. 95
  15. 58
  16. 51
  17. 90
  18. 21
  19. 82
  20. 168
  21. 154
  22. 98
  23. 88
  24. 182
  25. 85
  26. 64
  27. 146
  28. 190
  29. 130
  30. 40
  31. 114
  32. 194
  33. 172
  34. 138
  35. 142
  36. 16
  37. 83
  38. 89
  39. 170
  40. 47

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