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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 734 · 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. 1.71² =
  2. 2.92² =
  3. 3.98² =
  4. 4.45² =
  5. 5.58² =
  6. 6.65² =
  7. 7.51² =
  8. 8.44² =
  9. 9.59² =
  10. 10.42² =
  11. 11.39² =
  12. 12.88² =
  13. 13.41² =
  14. 14.61² =
  15. 15.67² =
  16. 16.96² =
  17. 17.46² =
  18. 18.89² =
  19. 19.97² =
  20. 20.79² =
  21. 21.38² =
  22. 22.81² =
  23. 23.91² =
  24. 24.83² =
  25. 25.74² =
  26. 26.76² =
  27. 27.48² =
  28. 28.82² =
  29. 29.31² =
  30. 30.66² =
  31. 31.77² =
  32. 32.95² =
  33. 33.33² =
  34. 34.86² =
  35. 35.54² =
  36. 36.62² =
  37. 37.37² =
  38. 38.35² =
  39. 39.63² =
  40. 40.93² =

Answer key

  1. 5041
  2. 8464
  3. 9604
  4. 2025
  5. 3364
  6. 4225
  7. 2601
  8. 1936
  9. 3481
  10. 1764
  11. 1521
  12. 7744
  13. 1681
  14. 3721
  15. 4489
  16. 9216
  17. 2116
  18. 7921
  19. 9409
  20. 6241
  21. 1444
  22. 6561
  23. 8281
  24. 6889
  25. 5476
  26. 5776
  27. 2304
  28. 6724
  29. 961
  30. 4356
  31. 5929
  32. 9025
  33. 1089
  34. 7396
  35. 2916
  36. 3844
  37. 1369
  38. 1225
  39. 3969
  40. 8649

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