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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 927 · 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 146 =
  2. 2.Double 49 =
  3. 3.Half of 162 =
  4. 4.Double 19 =
  5. 5.Half of 164 =
  6. 6.Half of 78 =
  7. 7.Half of 148 =
  8. 8.Half of 98 =
  9. 9.Double 91 =
  10. 10.Double 62 =
  11. 11.Double 38 =
  12. 12.Half of 42 =
  13. 13.Half of 34 =
  14. 14.Half of 68 =
  15. 15.Half of 66 =
  16. 16.Half of 88 =
  17. 17.Double 28 =
  18. 18.Half of 192 =
  19. 19.Half of 144 =
  20. 20.Double 69 =
  21. 21.Double 88 =
  22. 22.Double 99 =
  23. 23.Double 89 =
  24. 24.Double 42 =
  25. 25.Double 29 =
  26. 26.Half of 74 =
  27. 27.Double 16 =
  28. 28.Double 24 =
  29. 29.Half of 136 =
  30. 30.Double 21 =
  31. 31.Double 57 =
  32. 32.Double 59 =
  33. 33.Double 65 =
  34. 34.Half of 92 =
  35. 35.Double 76 =
  36. 36.Half of 38 =
  37. 37.Half of 160 =
  38. 38.Half of 52 =
  39. 39.Half of 104 =
  40. 40.Double 73 =

Answer key

  1. 73
  2. 98
  3. 81
  4. 38
  5. 82
  6. 39
  7. 74
  8. 49
  9. 182
  10. 124
  11. 76
  12. 21
  13. 17
  14. 34
  15. 33
  16. 44
  17. 56
  18. 96
  19. 72
  20. 138
  21. 176
  22. 198
  23. 178
  24. 84
  25. 58
  26. 37
  27. 32
  28. 48
  29. 68
  30. 42
  31. 114
  32. 118
  33. 130
  34. 46
  35. 152
  36. 19
  37. 80
  38. 26
  39. 52
  40. 146

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