← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 367 · 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.Double 96 =
  2. 2.Half of 74 =
  3. 3.Double 17 =
  4. 4.Double 81 =
  5. 5.Half of 116 =
  6. 6.Double 21 =
  7. 7.Double 43 =
  8. 8.Half of 104 =
  9. 9.Double 56 =
  10. 10.Double 84 =
  11. 11.Half of 108 =
  12. 12.Double 24 =
  13. 13.Double 32 =
  14. 14.Half of 114 =
  15. 15.Half of 90 =
  16. 16.Double 58 =
  17. 17.Double 61 =
  18. 18.Half of 30 =
  19. 19.Double 31 =
  20. 20.Half of 94 =
  21. 21.Double 54 =
  22. 22.Half of 110 =
  23. 23.Double 55 =
  24. 24.Double 63 =
  25. 25.Double 44 =
  26. 26.Half of 144 =
  27. 27.Double 65 =
  28. 28.Double 73 =
  29. 29.Double 79 =
  30. 30.Double 52 =
  31. 31.Double 97 =
  32. 32.Double 27 =
  33. 33.Half of 168 =
  34. 34.Double 38 =
  35. 35.Half of 148 =
  36. 36.Half of 62 =
  37. 37.Double 26 =
  38. 38.Half of 46 =
  39. 39.Double 94 =
  40. 40.Half of 196 =

Answer key

  1. 192
  2. 37
  3. 34
  4. 162
  5. 58
  6. 42
  7. 86
  8. 52
  9. 112
  10. 168
  11. 54
  12. 48
  13. 64
  14. 57
  15. 45
  16. 116
  17. 122
  18. 15
  19. 62
  20. 47
  21. 108
  22. 55
  23. 110
  24. 126
  25. 88
  26. 72
  27. 130
  28. 146
  29. 158
  30. 104
  31. 194
  32. 54
  33. 84
  34. 76
  35. 74
  36. 31
  37. 52
  38. 23
  39. 188
  40. 98

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