← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 322 · 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 68 =
  2. 2.Half of 178 =
  3. 3.Half of 100 =
  4. 4.Half of 34 =
  5. 5.Half of 190 =
  6. 6.Double 98 =
  7. 7.Double 63 =
  8. 8.Half of 132 =
  9. 9.Half of 74 =
  10. 10.Double 24 =
  11. 11.Half of 120 =
  12. 12.Double 17 =
  13. 13.Half of 138 =
  14. 14.Double 93 =
  15. 15.Half of 142 =
  16. 16.Double 91 =
  17. 17.Double 31 =
  18. 18.Double 55 =
  19. 19.Half of 102 =
  20. 20.Double 65 =
  21. 21.Double 75 =
  22. 22.Half of 162 =
  23. 23.Half of 92 =
  24. 24.Double 73 =
  25. 25.Double 59 =
  26. 26.Half of 56 =
  27. 27.Double 27 =
  28. 28.Half of 192 =
  29. 29.Half of 172 =
  30. 30.Half of 122 =
  31. 31.Double 92 =
  32. 32.Half of 98 =
  33. 33.Half of 40 =
  34. 34.Half of 148 =
  35. 35.Half of 26 =
  36. 36.Half of 30 =
  37. 37.Double 54 =
  38. 38.Double 72 =
  39. 39.Half of 140 =
  40. 40.Double 86 =

Answer key

  1. 34
  2. 89
  3. 50
  4. 17
  5. 95
  6. 196
  7. 126
  8. 66
  9. 37
  10. 48
  11. 60
  12. 34
  13. 69
  14. 186
  15. 71
  16. 182
  17. 62
  18. 110
  19. 51
  20. 130
  21. 150
  22. 81
  23. 46
  24. 146
  25. 118
  26. 28
  27. 54
  28. 96
  29. 86
  30. 61
  31. 184
  32. 49
  33. 20
  34. 74
  35. 13
  36. 15
  37. 108
  38. 144
  39. 70
  40. 172

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