← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 896 · 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 86 =
  2. 2.Double 37 =
  3. 3.Half of 40 =
  4. 4.Half of 64 =
  5. 5.Double 45 =
  6. 6.Half of 118 =
  7. 7.Half of 108 =
  8. 8.Double 92 =
  9. 9.Half of 68 =
  10. 10.Half of 158 =
  11. 11.Half of 66 =
  12. 12.Double 62 =
  13. 13.Double 46 =
  14. 14.Half of 160 =
  15. 15.Half of 186 =
  16. 16.Double 72 =
  17. 17.Half of 34 =
  18. 18.Double 53 =
  19. 19.Double 44 =
  20. 20.Double 56 =
  21. 21.Double 19 =
  22. 22.Double 54 =
  23. 23.Half of 90 =
  24. 24.Double 41 =
  25. 25.Double 63 =
  26. 26.Double 81 =
  27. 27.Half of 28 =
  28. 28.Half of 110 =
  29. 29.Half of 54 =
  30. 30.Double 49 =
  31. 31.Half of 116 =
  32. 32.Double 52 =
  33. 33.Double 51 =
  34. 34.Half of 128 =
  35. 35.Half of 150 =
  36. 36.Double 61 =
  37. 37.Double 83 =
  38. 38.Double 32 =
  39. 39.Double 95 =
  40. 40.Double 33 =

Answer key

  1. 43
  2. 74
  3. 20
  4. 32
  5. 90
  6. 59
  7. 54
  8. 184
  9. 34
  10. 79
  11. 33
  12. 124
  13. 92
  14. 80
  15. 93
  16. 144
  17. 17
  18. 106
  19. 88
  20. 112
  21. 38
  22. 108
  23. 45
  24. 82
  25. 126
  26. 162
  27. 14
  28. 55
  29. 27
  30. 98
  31. 58
  32. 104
  33. 102
  34. 64
  35. 75
  36. 122
  37. 166
  38. 64
  39. 190
  40. 66

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