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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 852 · 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 59 =
  2. 2.Double 97 =
  3. 3.Double 39 =
  4. 4.Double 31 =
  5. 5.Half of 190 =
  6. 6.Double 74 =
  7. 7.Half of 182 =
  8. 8.Double 17 =
  9. 9.Double 18 =
  10. 10.Double 68 =
  11. 11.Half of 124 =
  12. 12.Double 16 =
  13. 13.Double 61 =
  14. 14.Half of 94 =
  15. 15.Half of 170 =
  16. 16.Half of 152 =
  17. 17.Half of 136 =
  18. 18.Double 38 =
  19. 19.Double 52 =
  20. 20.Double 72 =
  21. 21.Double 25 =
  22. 22.Double 34 =
  23. 23.Double 45 =
  24. 24.Half of 28 =
  25. 25.Half of 132 =
  26. 26.Double 55 =
  27. 27.Double 89 =
  28. 28.Half of 188 =
  29. 29.Double 23 =
  30. 30.Double 98 =
  31. 31.Half of 52 =
  32. 32.Double 26 =
  33. 33.Double 64 =
  34. 34.Double 27 =
  35. 35.Half of 46 =
  36. 36.Double 93 =
  37. 37.Double 91 =
  38. 38.Double 48 =
  39. 39.Half of 144 =
  40. 40.Half of 98 =

Answer key

  1. 118
  2. 194
  3. 78
  4. 62
  5. 95
  6. 148
  7. 91
  8. 34
  9. 36
  10. 136
  11. 62
  12. 32
  13. 122
  14. 47
  15. 85
  16. 76
  17. 68
  18. 76
  19. 104
  20. 144
  21. 50
  22. 68
  23. 90
  24. 14
  25. 66
  26. 110
  27. 178
  28. 94
  29. 46
  30. 196
  31. 26
  32. 52
  33. 128
  34. 54
  35. 23
  36. 186
  37. 182
  38. 96
  39. 72
  40. 49

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