← 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 406 · 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. 1.87² =
  2. 2.63² =
  3. 3.91² =
  4. 4.42² =
  5. 5.74² =
  6. 6.39² =
  7. 7.72² =
  8. 8.81² =
  9. 9.89² =
  10. 10.51² =
  11. 11.95² =
  12. 12.71² =
  13. 13.36² =
  14. 14.78² =
  15. 15.99² =
  16. 16.79² =
  17. 17.67² =
  18. 18.37² =
  19. 19.33² =
  20. 20.82² =
  21. 21.57² =
  22. 22.49² =
  23. 23.45² =
  24. 24.61² =
  25. 25.48² =
  26. 26.41² =
  27. 27.97² =
  28. 28.43² =
  29. 29.46² =
  30. 30.68² =
  31. 31.59² =
  32. 32.86² =
  33. 33.34² =
  34. 34.66² =
  35. 35.38² =
  36. 36.53² =
  37. 37.73² =
  38. 38.93² =
  39. 39.35² =
  40. 40.85² =

Answer key

  1. 7569
  2. 3969
  3. 8281
  4. 1764
  5. 5476
  6. 1521
  7. 5184
  8. 6561
  9. 7921
  10. 2601
  11. 9025
  12. 5041
  13. 1296
  14. 6084
  15. 9801
  16. 6241
  17. 4489
  18. 1369
  19. 1089
  20. 6724
  21. 3249
  22. 2401
  23. 2025
  24. 3721
  25. 2304
  26. 1681
  27. 9409
  28. 1849
  29. 2116
  30. 4624
  31. 3481
  32. 7396
  33. 1156
  34. 4356
  35. 1444
  36. 2809
  37. 5329
  38. 8649
  39. 1225
  40. 7225

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