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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 596 · 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 21 =
  2. 2.Half of 198 =
  3. 3.Double 54 =
  4. 4.Half of 126 =
  5. 5.Double 44 =
  6. 6.Double 16 =
  7. 7.Double 97 =
  8. 8.Double 65 =
  9. 9.Half of 134 =
  10. 10.Half of 52 =
  11. 11.Double 59 =
  12. 12.Half of 108 =
  13. 13.Double 56 =
  14. 14.Half of 182 =
  15. 15.Double 27 =
  16. 16.Half of 158 =
  17. 17.Half of 146 =
  18. 18.Double 68 =
  19. 19.Half of 78 =
  20. 20.Double 72 =
  21. 21.Double 51 =
  22. 22.Double 98 =
  23. 23.Half of 168 =
  24. 24.Double 63 =
  25. 25.Double 17 =
  26. 26.Double 29 =
  27. 27.Double 41 =
  28. 28.Half of 172 =
  29. 29.Half of 64 =
  30. 30.Half of 128 =
  31. 31.Half of 46 =
  32. 32.Double 23 =
  33. 33.Half of 132 =
  34. 34.Double 66 =
  35. 35.Half of 36 =
  36. 36.Half of 166 =
  37. 37.Double 64 =
  38. 38.Half of 142 =
  39. 39.Double 85 =
  40. 40.Double 94 =

Answer key

  1. 42
  2. 99
  3. 108
  4. 63
  5. 88
  6. 32
  7. 194
  8. 130
  9. 67
  10. 26
  11. 118
  12. 54
  13. 112
  14. 91
  15. 54
  16. 79
  17. 73
  18. 136
  19. 39
  20. 144
  21. 102
  22. 196
  23. 84
  24. 126
  25. 34
  26. 58
  27. 82
  28. 86
  29. 32
  30. 64
  31. 23
  32. 46
  33. 66
  34. 132
  35. 18
  36. 83
  37. 128
  38. 71
  39. 170
  40. 188

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