← 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 904 · 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. 1.51² =
  2. 2.54² =
  3. 3.81² =
  4. 4.86² =
  5. 5.46² =
  6. 6.78² =
  7. 7.37² =
  8. 8.98² =
  9. 9.96² =
  10. 10.88² =
  11. 11.32² =
  12. 12.59² =
  13. 13.41² =
  14. 14.49² =
  15. 15.92² =
  16. 16.67² =
  17. 17.52² =
  18. 18.69² =
  19. 19.39² =
  20. 20.74² =
  21. 21.91² =
  22. 22.57² =
  23. 23.72² =
  24. 24.85² =
  25. 25.75² =
  26. 26.68² =
  27. 27.63² =
  28. 28.66² =
  29. 29.71² =
  30. 30.95² =
  31. 31.89² =
  32. 32.82² =
  33. 33.35² =
  34. 34.84² =
  35. 35.77² =
  36. 36.94² =
  37. 37.99² =
  38. 38.93² =
  39. 39.45² =
  40. 40.76² =

Answer key

  1. 2601
  2. 2916
  3. 6561
  4. 7396
  5. 2116
  6. 6084
  7. 1369
  8. 9604
  9. 9216
  10. 7744
  11. 1024
  12. 3481
  13. 1681
  14. 2401
  15. 8464
  16. 4489
  17. 2704
  18. 4761
  19. 1521
  20. 5476
  21. 8281
  22. 3249
  23. 5184
  24. 7225
  25. 5625
  26. 4624
  27. 3969
  28. 4356
  29. 5041
  30. 9025
  31. 7921
  32. 6724
  33. 1225
  34. 7056
  35. 5929
  36. 8836
  37. 9801
  38. 8649
  39. 2025
  40. 5776

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