← Square any 2-digit number: up and down lesson New set →

Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 341 · 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. 1.68² =
  2. 2.65² =
  3. 3.71² =
  4. 4.69² =
  5. 5.94² =
  6. 6.33² =
  7. 7.77² =
  8. 8.95² =
  9. 9.35² =
  10. 10.92² =
  11. 11.83² =
  12. 12.42² =
  13. 13.36² =
  14. 14.86² =
  15. 15.89² =
  16. 16.81² =
  17. 17.74² =
  18. 18.32² =
  19. 19.43² =
  20. 20.41² =
  21. 21.58² =
  22. 22.56² =
  23. 23.39² =
  24. 24.57² =
  25. 25.75² =
  26. 26.62² =
  27. 27.52² =
  28. 28.61² =
  29. 29.93² =
  30. 30.91² =
  31. 31.51² =
  32. 32.78² =
  33. 33.76² =
  34. 34.85² =
  35. 35.67² =
  36. 36.82² =
  37. 37.38² =
  38. 38.48² =
  39. 39.79² =
  40. 40.97² =

Answer key

  1. 4624
  2. 4225
  3. 5041
  4. 4761
  5. 8836
  6. 1089
  7. 5929
  8. 9025
  9. 1225
  10. 8464
  11. 6889
  12. 1764
  13. 1296
  14. 7396
  15. 7921
  16. 6561
  17. 5476
  18. 1024
  19. 1849
  20. 1681
  21. 3364
  22. 3136
  23. 1521
  24. 3249
  25. 5625
  26. 3844
  27. 2704
  28. 3721
  29. 8649
  30. 8281
  31. 2601
  32. 6084
  33. 5776
  34. 7225
  35. 4489
  36. 6724
  37. 1444
  38. 2304
  39. 6241
  40. 9409

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths