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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 590 · 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. 1.64² =
  2. 2.89² =
  3. 3.94² =
  4. 4.87² =
  5. 5.73² =
  6. 6.99² =
  7. 7.49² =
  8. 8.76² =
  9. 9.86² =
  10. 10.58² =
  11. 11.61² =
  12. 12.44² =
  13. 13.62² =
  14. 14.37² =
  15. 15.71² =
  16. 16.46² =
  17. 17.57² =
  18. 18.63² =
  19. 19.31² =
  20. 20.45² =
  21. 21.93² =
  22. 22.75² =
  23. 23.74² =
  24. 24.48² =
  25. 25.32² =
  26. 26.84² =
  27. 27.85² =
  28. 28.96² =
  29. 29.41² =
  30. 30.88² =
  31. 31.91² =
  32. 32.95² =
  33. 33.47² =
  34. 34.79² =
  35. 35.77² =
  36. 36.81² =
  37. 37.39² =
  38. 38.55² =
  39. 39.68² =
  40. 40.66² =

Answer key

  1. 4096
  2. 7921
  3. 8836
  4. 7569
  5. 5329
  6. 9801
  7. 2401
  8. 5776
  9. 7396
  10. 3364
  11. 3721
  12. 1936
  13. 3844
  14. 1369
  15. 5041
  16. 2116
  17. 3249
  18. 3969
  19. 961
  20. 2025
  21. 8649
  22. 5625
  23. 5476
  24. 2304
  25. 1024
  26. 7056
  27. 7225
  28. 9216
  29. 1681
  30. 7744
  31. 8281
  32. 9025
  33. 2209
  34. 6241
  35. 5929
  36. 6561
  37. 1521
  38. 3025
  39. 4624
  40. 4356

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