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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 425 · 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 84 =
  2. 2.Half of 74 =
  3. 3.Half of 56 =
  4. 4.Double 33 =
  5. 5.Double 69 =
  6. 6.Half of 146 =
  7. 7.Half of 160 =
  8. 8.Half of 48 =
  9. 9.Half of 92 =
  10. 10.Double 38 =
  11. 11.Double 57 =
  12. 12.Half of 152 =
  13. 13.Double 24 =
  14. 14.Half of 90 =
  15. 15.Double 96 =
  16. 16.Double 93 =
  17. 17.Double 87 =
  18. 18.Half of 52 =
  19. 19.Double 43 =
  20. 20.Half of 142 =
  21. 21.Double 51 =
  22. 22.Double 64 =
  23. 23.Double 17 =
  24. 24.Double 31 =
  25. 25.Double 65 =
  26. 26.Double 98 =
  27. 27.Half of 186 =
  28. 28.Double 59 =
  29. 29.Half of 164 =
  30. 30.Half of 66 =
  31. 31.Double 18 =
  32. 32.Half of 98 =
  33. 33.Double 88 =
  34. 34.Double 55 =
  35. 35.Half of 62 =
  36. 36.Double 53 =
  37. 37.Double 27 =
  38. 38.Half of 154 =
  39. 39.Double 45 =
  40. 40.Half of 170 =

Answer key

  1. 42
  2. 37
  3. 28
  4. 66
  5. 138
  6. 73
  7. 80
  8. 24
  9. 46
  10. 76
  11. 114
  12. 76
  13. 48
  14. 45
  15. 192
  16. 186
  17. 174
  18. 26
  19. 86
  20. 71
  21. 102
  22. 128
  23. 34
  24. 62
  25. 130
  26. 196
  27. 93
  28. 118
  29. 82
  30. 33
  31. 36
  32. 49
  33. 176
  34. 110
  35. 31
  36. 106
  37. 54
  38. 77
  39. 90
  40. 85

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