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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 193 · 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. 1.43² =
  2. 2.61² =
  3. 3.95² =
  4. 4.54² =
  5. 5.73² =
  6. 6.96² =
  7. 7.63² =
  8. 8.67² =
  9. 9.81² =
  10. 10.66² =
  11. 11.74² =
  12. 12.41² =
  13. 13.42² =
  14. 14.53² =
  15. 15.37² =
  16. 16.98² =
  17. 17.32² =
  18. 18.78² =
  19. 19.99² =
  20. 20.45² =
  21. 21.84² =
  22. 22.91² =
  23. 23.86² =
  24. 24.49² =
  25. 25.83² =
  26. 26.39² =
  27. 27.58² =
  28. 28.71² =
  29. 29.75² =
  30. 30.51² =
  31. 31.31² =
  32. 32.76² =
  33. 33.87² =
  34. 34.59² =
  35. 35.57² =
  36. 36.34² =
  37. 37.36² =
  38. 38.72² =
  39. 39.52² =
  40. 40.48² =

Answer key

  1. 1849
  2. 3721
  3. 9025
  4. 2916
  5. 5329
  6. 9216
  7. 3969
  8. 4489
  9. 6561
  10. 4356
  11. 5476
  12. 1681
  13. 1764
  14. 2809
  15. 1369
  16. 9604
  17. 1024
  18. 6084
  19. 9801
  20. 2025
  21. 7056
  22. 8281
  23. 7396
  24. 2401
  25. 6889
  26. 1521
  27. 3364
  28. 5041
  29. 5625
  30. 2601
  31. 961
  32. 5776
  33. 7569
  34. 3481
  35. 3249
  36. 1156
  37. 1296
  38. 5184
  39. 2704
  40. 2304

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