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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 817 · 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. 1.31² =
  2. 2.37² =
  3. 3.71² =
  4. 4.51² =
  5. 5.35² =
  6. 6.38² =
  7. 7.84² =
  8. 8.67² =
  9. 9.41² =
  10. 10.87² =
  11. 11.33² =
  12. 12.82² =
  13. 13.76² =
  14. 14.58² =
  15. 15.49² =
  16. 16.69² =
  17. 17.46² =
  18. 18.59² =
  19. 19.53² =
  20. 20.57² =
  21. 21.47² =
  22. 22.44² =
  23. 23.85² =
  24. 24.74² =
  25. 25.61² =
  26. 26.36² =
  27. 27.73² =
  28. 28.98² =
  29. 29.66² =
  30. 30.45² =
  31. 31.43² =
  32. 32.55² =
  33. 33.92² =
  34. 34.75² =
  35. 35.48² =
  36. 36.56² =
  37. 37.91² =
  38. 38.89² =
  39. 39.83² =
  40. 40.68² =

Answer key

  1. 961
  2. 1369
  3. 5041
  4. 2601
  5. 1225
  6. 1444
  7. 7056
  8. 4489
  9. 1681
  10. 7569
  11. 1089
  12. 6724
  13. 5776
  14. 3364
  15. 2401
  16. 4761
  17. 2116
  18. 3481
  19. 2809
  20. 3249
  21. 2209
  22. 1936
  23. 7225
  24. 5476
  25. 3721
  26. 1296
  27. 5329
  28. 9604
  29. 4356
  30. 2025
  31. 1849
  32. 3025
  33. 8464
  34. 5625
  35. 2304
  36. 3136
  37. 8281
  38. 7921
  39. 6889
  40. 4624

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