← 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 123 · 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. 1.52² =
  2. 2.38² =
  3. 3.56² =
  4. 4.95² =
  5. 5.51² =
  6. 6.59² =
  7. 7.37² =
  8. 8.61² =
  9. 9.85² =
  10. 10.81² =
  11. 11.67² =
  12. 12.93² =
  13. 13.32² =
  14. 14.35² =
  15. 15.78² =
  16. 16.49² =
  17. 17.36² =
  18. 18.41² =
  19. 19.91² =
  20. 20.47² =
  21. 21.34² =
  22. 22.33² =
  23. 23.66² =
  24. 24.73² =
  25. 25.92² =
  26. 26.63² =
  27. 27.89² =
  28. 28.83² =
  29. 29.96² =
  30. 30.42² =
  31. 31.86² =
  32. 32.64² =
  33. 33.48² =
  34. 34.46² =
  35. 35.88² =
  36. 36.82² =
  37. 37.79² =
  38. 38.76² =
  39. 39.74² =
  40. 40.71² =

Answer key

  1. 2704
  2. 1444
  3. 3136
  4. 9025
  5. 2601
  6. 3481
  7. 1369
  8. 3721
  9. 7225
  10. 6561
  11. 4489
  12. 8649
  13. 1024
  14. 1225
  15. 6084
  16. 2401
  17. 1296
  18. 1681
  19. 8281
  20. 2209
  21. 1156
  22. 1089
  23. 4356
  24. 5329
  25. 8464
  26. 3969
  27. 7921
  28. 6889
  29. 9216
  30. 1764
  31. 7396
  32. 4096
  33. 2304
  34. 2116
  35. 7744
  36. 6724
  37. 6241
  38. 5776
  39. 5476
  40. 5041

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