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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 170 · 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 56 =
  2. 2.Double 65 =
  3. 3.Half of 60 =
  4. 4.Double 73 =
  5. 5.Double 91 =
  6. 6.Double 86 =
  7. 7.Double 61 =
  8. 8.Double 23 =
  9. 9.Half of 138 =
  10. 10.Half of 188 =
  11. 11.Half of 68 =
  12. 12.Double 63 =
  13. 13.Double 55 =
  14. 14.Double 22 =
  15. 15.Double 25 =
  16. 16.Half of 198 =
  17. 17.Double 98 =
  18. 18.Double 31 =
  19. 19.Half of 26 =
  20. 20.Double 74 =
  21. 21.Double 94 =
  22. 22.Half of 80 =
  23. 23.Double 54 =
  24. 24.Half of 130 =
  25. 25.Half of 54 =
  26. 26.Double 35 =
  27. 27.Half of 154 =
  28. 28.Half of 134 =
  29. 29.Double 51 =
  30. 30.Double 96 =
  31. 31.Half of 122 =
  32. 32.Double 34 =
  33. 33.Double 36 =
  34. 34.Half of 178 =
  35. 35.Double 44 =
  36. 36.Double 32 =
  37. 37.Half of 36 =
  38. 38.Double 45 =
  39. 39.Double 85 =
  40. 40.Double 81 =

Answer key

  1. 112
  2. 130
  3. 30
  4. 146
  5. 182
  6. 172
  7. 122
  8. 46
  9. 69
  10. 94
  11. 34
  12. 126
  13. 110
  14. 44
  15. 50
  16. 99
  17. 196
  18. 62
  19. 13
  20. 148
  21. 188
  22. 40
  23. 108
  24. 65
  25. 27
  26. 70
  27. 77
  28. 67
  29. 102
  30. 192
  31. 61
  32. 68
  33. 72
  34. 89
  35. 88
  36. 64
  37. 18
  38. 90
  39. 170
  40. 162

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