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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 214 · 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. 1.41² =
  2. 2.51² =
  3. 3.54² =
  4. 4.87² =
  5. 5.33² =
  6. 6.49² =
  7. 7.91² =
  8. 8.61² =
  9. 9.43² =
  10. 10.32² =
  11. 11.39² =
  12. 12.69² =
  13. 13.97² =
  14. 14.42² =
  15. 15.89² =
  16. 16.45² =
  17. 17.31² =
  18. 18.79² =
  19. 19.44² =
  20. 20.74² =
  21. 21.53² =
  22. 22.72² =
  23. 23.93² =
  24. 24.55² =
  25. 25.95² =
  26. 26.96² =
  27. 27.92² =
  28. 28.75² =
  29. 29.63² =
  30. 30.37² =
  31. 31.56² =
  32. 32.47² =
  33. 33.78² =
  34. 34.86² =
  35. 35.94² =
  36. 36.36² =
  37. 37.82² =
  38. 38.67² =
  39. 39.48² =
  40. 40.34² =

Answer key

  1. 1681
  2. 2601
  3. 2916
  4. 7569
  5. 1089
  6. 2401
  7. 8281
  8. 3721
  9. 1849
  10. 1024
  11. 1521
  12. 4761
  13. 9409
  14. 1764
  15. 7921
  16. 2025
  17. 961
  18. 6241
  19. 1936
  20. 5476
  21. 2809
  22. 5184
  23. 8649
  24. 3025
  25. 9025
  26. 9216
  27. 8464
  28. 5625
  29. 3969
  30. 1369
  31. 3136
  32. 2209
  33. 6084
  34. 7396
  35. 8836
  36. 1296
  37. 6724
  38. 4489
  39. 2304
  40. 1156

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