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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 182 · 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. 1.94² =
  2. 2.39² =
  3. 3.86² =
  4. 4.53² =
  5. 5.47² =
  6. 6.93² =
  7. 7.52² =
  8. 8.68² =
  9. 9.98² =
  10. 10.31² =
  11. 11.67² =
  12. 12.41² =
  13. 13.79² =
  14. 14.34² =
  15. 15.95² =
  16. 16.37² =
  17. 17.33² =
  18. 18.97² =
  19. 19.44² =
  20. 20.64² =
  21. 21.82² =
  22. 22.92² =
  23. 23.51² =
  24. 24.59² =
  25. 25.45² =
  26. 26.71² =
  27. 27.88² =
  28. 28.58² =
  29. 29.42² =
  30. 30.65² =
  31. 31.49² =
  32. 32.83² =
  33. 33.81² =
  34. 34.63² =
  35. 35.38² =
  36. 36.91² =
  37. 37.32² =
  38. 38.84² =
  39. 39.36² =
  40. 40.96² =

Answer key

  1. 8836
  2. 1521
  3. 7396
  4. 2809
  5. 2209
  6. 8649
  7. 2704
  8. 4624
  9. 9604
  10. 961
  11. 4489
  12. 1681
  13. 6241
  14. 1156
  15. 9025
  16. 1369
  17. 1089
  18. 9409
  19. 1936
  20. 4096
  21. 6724
  22. 8464
  23. 2601
  24. 3481
  25. 2025
  26. 5041
  27. 7744
  28. 3364
  29. 1764
  30. 4225
  31. 2401
  32. 6889
  33. 6561
  34. 3969
  35. 1444
  36. 8281
  37. 1024
  38. 7056
  39. 1296
  40. 9216

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