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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 763 · 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 96 =
  2. 2.Half of 86 =
  3. 3.Half of 134 =
  4. 4.Double 21 =
  5. 5.Double 34 =
  6. 6.Half of 136 =
  7. 7.Half of 194 =
  8. 8.Half of 56 =
  9. 9.Double 36 =
  10. 10.Half of 94 =
  11. 11.Half of 118 =
  12. 12.Double 76 =
  13. 13.Double 27 =
  14. 14.Half of 50 =
  15. 15.Double 28 =
  16. 16.Half of 170 =
  17. 17.Double 17 =
  18. 18.Half of 32 =
  19. 19.Double 54 =
  20. 20.Double 98 =
  21. 21.Half of 182 =
  22. 22.Double 91 =
  23. 23.Double 87 =
  24. 24.Half of 154 =
  25. 25.Half of 68 =
  26. 26.Half of 74 =
  27. 27.Half of 198 =
  28. 28.Half of 34 =
  29. 29.Half of 158 =
  30. 30.Double 85 =
  31. 31.Half of 46 =
  32. 32.Double 71 =
  33. 33.Double 41 =
  34. 34.Double 86 =
  35. 35.Half of 44 =
  36. 36.Half of 26 =
  37. 37.Double 94 =
  38. 38.Double 46 =
  39. 39.Double 69 =
  40. 40.Half of 90 =

Answer key

  1. 192
  2. 43
  3. 67
  4. 42
  5. 68
  6. 68
  7. 97
  8. 28
  9. 72
  10. 47
  11. 59
  12. 152
  13. 54
  14. 25
  15. 56
  16. 85
  17. 34
  18. 16
  19. 108
  20. 196
  21. 91
  22. 182
  23. 174
  24. 77
  25. 34
  26. 37
  27. 99
  28. 17
  29. 79
  30. 170
  31. 23
  32. 142
  33. 82
  34. 172
  35. 22
  36. 13
  37. 188
  38. 92
  39. 138
  40. 45

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