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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 776 · 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 28 =
  2. 2.Double 53 =
  3. 3.Half of 194 =
  4. 4.Half of 76 =
  5. 5.Double 69 =
  6. 6.Double 87 =
  7. 7.Double 77 =
  8. 8.Double 61 =
  9. 9.Double 71 =
  10. 10.Double 59 =
  11. 11.Half of 90 =
  12. 12.Half of 102 =
  13. 13.Double 21 =
  14. 14.Half of 28 =
  15. 15.Half of 166 =
  16. 16.Double 92 =
  17. 17.Half of 92 =
  18. 18.Half of 192 =
  19. 19.Half of 160 =
  20. 20.Half of 176 =
  21. 21.Half of 52 =
  22. 22.Double 42 =
  23. 23.Double 18 =
  24. 24.Double 52 =
  25. 25.Double 85 =
  26. 26.Half of 144 =
  27. 27.Double 91 =
  28. 28.Double 54 =
  29. 29.Half of 118 =
  30. 30.Double 37 =
  31. 31.Half of 184 =
  32. 32.Double 36 =
  33. 33.Half of 72 =
  34. 34.Double 73 =
  35. 35.Half of 198 =
  36. 36.Half of 84 =
  37. 37.Double 74 =
  38. 38.Half of 156 =
  39. 39.Half of 106 =
  40. 40.Half of 98 =

Answer key

  1. 56
  2. 106
  3. 97
  4. 38
  5. 138
  6. 174
  7. 154
  8. 122
  9. 142
  10. 118
  11. 45
  12. 51
  13. 42
  14. 14
  15. 83
  16. 184
  17. 46
  18. 96
  19. 80
  20. 88
  21. 26
  22. 84
  23. 36
  24. 104
  25. 170
  26. 72
  27. 182
  28. 108
  29. 59
  30. 74
  31. 92
  32. 72
  33. 36
  34. 146
  35. 99
  36. 42
  37. 148
  38. 78
  39. 53
  40. 49

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