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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 600 · 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. 1.61² =
  2. 2.98² =
  3. 3.79² =
  4. 4.75² =
  5. 5.34² =
  6. 6.47² =
  7. 7.93² =
  8. 8.46² =
  9. 9.97² =
  10. 10.77² =
  11. 11.99² =
  12. 12.71² =
  13. 13.55² =
  14. 14.51² =
  15. 15.57² =
  16. 16.76² =
  17. 17.96² =
  18. 18.32² =
  19. 19.39² =
  20. 20.59² =
  21. 21.73² =
  22. 22.48² =
  23. 23.66² =
  24. 24.84² =
  25. 25.36² =
  26. 26.33² =
  27. 27.87² =
  28. 28.83² =
  29. 29.94² =
  30. 30.88² =
  31. 31.49² =
  32. 32.35² =
  33. 33.43² =
  34. 34.69² =
  35. 35.89² =
  36. 36.42² =
  37. 37.41² =
  38. 38.81² =
  39. 39.58² =
  40. 40.68² =

Answer key

  1. 3721
  2. 9604
  3. 6241
  4. 5625
  5. 1156
  6. 2209
  7. 8649
  8. 2116
  9. 9409
  10. 5929
  11. 9801
  12. 5041
  13. 3025
  14. 2601
  15. 3249
  16. 5776
  17. 9216
  18. 1024
  19. 1521
  20. 3481
  21. 5329
  22. 2304
  23. 4356
  24. 7056
  25. 1296
  26. 1089
  27. 7569
  28. 6889
  29. 8836
  30. 7744
  31. 2401
  32. 1225
  33. 1849
  34. 4761
  35. 7921
  36. 1764
  37. 1681
  38. 6561
  39. 3364
  40. 4624

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