← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 646 · 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 120 =
  2. 2.Half of 50 =
  3. 3.Double 91 =
  4. 4.Half of 34 =
  5. 5.Double 72 =
  6. 6.Half of 70 =
  7. 7.Double 86 =
  8. 8.Half of 132 =
  9. 9.Half of 154 =
  10. 10.Double 71 =
  11. 11.Half of 142 =
  12. 12.Double 97 =
  13. 13.Double 48 =
  14. 14.Double 63 =
  15. 15.Double 36 =
  16. 16.Half of 170 =
  17. 17.Double 98 =
  18. 18.Half of 194 =
  19. 19.Double 35 =
  20. 20.Double 67 =
  21. 21.Double 53 =
  22. 22.Double 23 =
  23. 23.Half of 32 =
  24. 24.Half of 176 =
  25. 25.Double 54 =
  26. 26.Half of 126 =
  27. 27.Half of 96 =
  28. 28.Double 38 =
  29. 29.Half of 100 =
  30. 30.Double 78 =
  31. 31.Half of 42 =
  32. 32.Double 93 =
  33. 33.Half of 86 =
  34. 34.Double 74 =
  35. 35.Double 57 =
  36. 36.Double 21 =
  37. 37.Half of 52 =
  38. 38.Half of 160 =
  39. 39.Double 89 =
  40. 40.Half of 80 =

Answer key

  1. 60
  2. 25
  3. 182
  4. 17
  5. 144
  6. 35
  7. 172
  8. 66
  9. 77
  10. 142
  11. 71
  12. 194
  13. 96
  14. 126
  15. 72
  16. 85
  17. 196
  18. 97
  19. 70
  20. 134
  21. 106
  22. 46
  23. 16
  24. 88
  25. 108
  26. 63
  27. 48
  28. 76
  29. 50
  30. 156
  31. 21
  32. 186
  33. 43
  34. 148
  35. 114
  36. 42
  37. 26
  38. 80
  39. 178
  40. 40

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