← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 242 · 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 36 =
  2. 2.Half of 164 =
  3. 3.Half of 132 =
  4. 4.Double 96 =
  5. 5.Double 34 =
  6. 6.Double 71 =
  7. 7.Half of 84 =
  8. 8.Half of 40 =
  9. 9.Half of 150 =
  10. 10.Double 23 =
  11. 11.Double 38 =
  12. 12.Double 75 =
  13. 13.Half of 68 =
  14. 14.Half of 112 =
  15. 15.Double 33 =
  16. 16.Double 49 =
  17. 17.Half of 66 =
  18. 18.Half of 134 =
  19. 19.Double 28 =
  20. 20.Half of 102 =
  21. 21.Half of 74 =
  22. 22.Half of 48 =
  23. 23.Double 44 =
  24. 24.Double 55 =
  25. 25.Double 16 =
  26. 26.Half of 158 =
  27. 27.Half of 170 =
  28. 28.Half of 130 =
  29. 29.Half of 58 =
  30. 30.Half of 180 =
  31. 31.Double 19 =
  32. 32.Double 66 =
  33. 33.Double 59 =
  34. 34.Double 64 =
  35. 35.Half of 86 =
  36. 36.Half of 148 =
  37. 37.Double 52 =
  38. 38.Double 98 =
  39. 39.Half of 136 =
  40. 40.Double 69 =

Answer key

  1. 72
  2. 82
  3. 66
  4. 192
  5. 68
  6. 142
  7. 42
  8. 20
  9. 75
  10. 46
  11. 76
  12. 150
  13. 34
  14. 56
  15. 66
  16. 98
  17. 33
  18. 67
  19. 56
  20. 51
  21. 37
  22. 24
  23. 88
  24. 110
  25. 32
  26. 79
  27. 85
  28. 65
  29. 29
  30. 90
  31. 38
  32. 132
  33. 118
  34. 128
  35. 43
  36. 74
  37. 104
  38. 196
  39. 68
  40. 138

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