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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 526 · 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. 1.39² =
  2. 2.83² =
  3. 3.57² =
  4. 4.95² =
  5. 5.81² =
  6. 6.64² =
  7. 7.56² =
  8. 8.33² =
  9. 9.84² =
  10. 10.86² =
  11. 11.74² =
  12. 12.55² =
  13. 13.94² =
  14. 14.38² =
  15. 15.34² =
  16. 16.79² =
  17. 17.49² =
  18. 18.45² =
  19. 19.73² =
  20. 20.42² =
  21. 21.71² =
  22. 22.82² =
  23. 23.47² =
  24. 24.32² =
  25. 25.58² =
  26. 26.93² =
  27. 27.31² =
  28. 28.85² =
  29. 29.61² =
  30. 30.67² =
  31. 31.88² =
  32. 32.43² =
  33. 33.51² =
  34. 34.41² =
  35. 35.76² =
  36. 36.75² =
  37. 37.35² =
  38. 38.69² =
  39. 39.48² =
  40. 40.97² =

Answer key

  1. 1521
  2. 6889
  3. 3249
  4. 9025
  5. 6561
  6. 4096
  7. 3136
  8. 1089
  9. 7056
  10. 7396
  11. 5476
  12. 3025
  13. 8836
  14. 1444
  15. 1156
  16. 6241
  17. 2401
  18. 2025
  19. 5329
  20. 1764
  21. 5041
  22. 6724
  23. 2209
  24. 1024
  25. 3364
  26. 8649
  27. 961
  28. 7225
  29. 3721
  30. 4489
  31. 7744
  32. 1849
  33. 2601
  34. 1681
  35. 5776
  36. 5625
  37. 1225
  38. 4761
  39. 2304
  40. 9409

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