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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 503 · 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. 1.33² =
  2. 2.99² =
  3. 3.37² =
  4. 4.98² =
  5. 5.93² =
  6. 6.67² =
  7. 7.61² =
  8. 8.31² =
  9. 9.96² =
  10. 10.82² =
  11. 11.43² =
  12. 12.95² =
  13. 13.65² =
  14. 14.53² =
  15. 15.41² =
  16. 16.71² =
  17. 17.36² =
  18. 18.74² =
  19. 19.35² =
  20. 20.34² =
  21. 21.44² =
  22. 22.83² =
  23. 23.77² =
  24. 24.86² =
  25. 25.58² =
  26. 26.59² =
  27. 27.38² =
  28. 28.51² =
  29. 29.63² =
  30. 30.81² =
  31. 31.64² =
  32. 32.47² =
  33. 33.88² =
  34. 34.68² =
  35. 35.66² =
  36. 36.48² =
  37. 37.42² =
  38. 38.78² =
  39. 39.55² =
  40. 40.32² =

Answer key

  1. 1089
  2. 9801
  3. 1369
  4. 9604
  5. 8649
  6. 4489
  7. 3721
  8. 961
  9. 9216
  10. 6724
  11. 1849
  12. 9025
  13. 4225
  14. 2809
  15. 1681
  16. 5041
  17. 1296
  18. 5476
  19. 1225
  20. 1156
  21. 1936
  22. 6889
  23. 5929
  24. 7396
  25. 3364
  26. 3481
  27. 1444
  28. 2601
  29. 3969
  30. 6561
  31. 4096
  32. 2209
  33. 7744
  34. 4624
  35. 4356
  36. 2304
  37. 1764
  38. 6084
  39. 3025
  40. 1024

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