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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 797 · 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 42 =
  2. 2.Half of 116 =
  3. 3.Double 85 =
  4. 4.Half of 28 =
  5. 5.Half of 190 =
  6. 6.Double 17 =
  7. 7.Double 99 =
  8. 8.Half of 178 =
  9. 9.Double 74 =
  10. 10.Double 35 =
  11. 11.Half of 78 =
  12. 12.Double 41 =
  13. 13.Double 68 =
  14. 14.Double 65 =
  15. 15.Half of 48 =
  16. 16.Half of 168 =
  17. 17.Half of 122 =
  18. 18.Double 96 =
  19. 19.Half of 56 =
  20. 20.Half of 102 =
  21. 21.Double 34 =
  22. 22.Double 45 =
  23. 23.Double 43 =
  24. 24.Double 56 =
  25. 25.Double 98 =
  26. 26.Double 75 =
  27. 27.Double 52 =
  28. 28.Double 69 =
  29. 29.Double 76 =
  30. 30.Double 97 =
  31. 31.Half of 60 =
  32. 32.Double 37 =
  33. 33.Half of 26 =
  34. 34.Double 33 =
  35. 35.Half of 184 =
  36. 36.Half of 128 =
  37. 37.Double 95 =
  38. 38.Half of 90 =
  39. 39.Double 23 =
  40. 40.Double 71 =

Answer key

  1. 21
  2. 58
  3. 170
  4. 14
  5. 95
  6. 34
  7. 198
  8. 89
  9. 148
  10. 70
  11. 39
  12. 82
  13. 136
  14. 130
  15. 24
  16. 84
  17. 61
  18. 192
  19. 28
  20. 51
  21. 68
  22. 90
  23. 86
  24. 112
  25. 196
  26. 150
  27. 104
  28. 138
  29. 152
  30. 194
  31. 30
  32. 74
  33. 13
  34. 66
  35. 92
  36. 64
  37. 190
  38. 45
  39. 46
  40. 142

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