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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 873 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.56² =
  2. 2.63² =
  3. 3.81² =
  4. 4.51² =
  5. 5.39² =
  6. 6.33² =
  7. 7.41² =
  8. 8.72² =
  9. 9.49² =
  10. 10.94² =
  11. 11.62² =
  12. 12.61² =
  13. 13.46² =
  14. 14.36² =
  15. 15.52² =
  16. 16.54² =
  17. 17.32² =
  18. 18.66² =
  19. 19.96² =
  20. 20.79² =
  21. 21.97² =
  22. 22.91² =
  23. 23.68² =
  24. 24.88² =
  25. 25.53² =
  26. 26.58² =
  27. 27.82² =
  28. 28.67² =
  29. 29.65² =
  30. 30.71² =
  31. 31.47² =
  32. 32.69² =
  33. 33.99² =
  34. 34.37² =
  35. 35.93² =
  36. 36.43² =
  37. 37.92² =
  38. 38.55² =
  39. 39.73² =
  40. 40.78² =

Answer key

  1. 3136
  2. 3969
  3. 6561
  4. 2601
  5. 1521
  6. 1089
  7. 1681
  8. 5184
  9. 2401
  10. 8836
  11. 3844
  12. 3721
  13. 2116
  14. 1296
  15. 2704
  16. 2916
  17. 1024
  18. 4356
  19. 9216
  20. 6241
  21. 9409
  22. 8281
  23. 4624
  24. 7744
  25. 2809
  26. 3364
  27. 6724
  28. 4489
  29. 4225
  30. 5041
  31. 2209
  32. 4761
  33. 9801
  34. 1369
  35. 8649
  36. 1849
  37. 8464
  38. 3025
  39. 5329
  40. 6084

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