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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 799 · 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 31 =
  2. 2.Double 77 =
  3. 3.Half of 60 =
  4. 4.Double 28 =
  5. 5.Double 73 =
  6. 6.Double 41 =
  7. 7.Double 68 =
  8. 8.Double 95 =
  9. 9.Double 27 =
  10. 10.Double 59 =
  11. 11.Half of 142 =
  12. 12.Half of 174 =
  13. 13.Double 34 =
  14. 14.Double 51 =
  15. 15.Double 86 =
  16. 16.Double 74 =
  17. 17.Half of 76 =
  18. 18.Half of 54 =
  19. 19.Double 21 =
  20. 20.Double 24 =
  21. 21.Double 43 =
  22. 22.Double 98 =
  23. 23.Double 89 =
  24. 24.Half of 160 =
  25. 25.Double 35 =
  26. 26.Half of 90 =
  27. 27.Half of 68 =
  28. 28.Half of 158 =
  29. 29.Half of 98 =
  30. 30.Double 91 =
  31. 31.Half of 30 =
  32. 32.Double 19 =
  33. 33.Double 63 =
  34. 34.Half of 66 =
  35. 35.Half of 134 =
  36. 36.Half of 126 =
  37. 37.Half of 122 =
  38. 38.Half of 164 =
  39. 39.Half of 130 =
  40. 40.Double 58 =

Answer key

  1. 62
  2. 154
  3. 30
  4. 56
  5. 146
  6. 82
  7. 136
  8. 190
  9. 54
  10. 118
  11. 71
  12. 87
  13. 68
  14. 102
  15. 172
  16. 148
  17. 38
  18. 27
  19. 42
  20. 48
  21. 86
  22. 196
  23. 178
  24. 80
  25. 70
  26. 45
  27. 34
  28. 79
  29. 49
  30. 182
  31. 15
  32. 38
  33. 126
  34. 33
  35. 67
  36. 63
  37. 61
  38. 82
  39. 65
  40. 116

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