← 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 989 · 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. 1.37² =
  2. 2.65² =
  3. 3.56² =
  4. 4.91² =
  5. 5.89² =
  6. 6.68² =
  7. 7.83² =
  8. 8.49² =
  9. 9.88² =
  10. 10.39² =
  11. 11.71² =
  12. 12.79² =
  13. 13.43² =
  14. 14.87² =
  15. 15.36² =
  16. 16.98² =
  17. 17.32² =
  18. 18.76² =
  19. 19.58² =
  20. 20.92² =
  21. 21.46² =
  22. 22.95² =
  23. 23.51² =
  24. 24.48² =
  25. 25.96² =
  26. 26.45² =
  27. 27.66² =
  28. 28.69² =
  29. 29.52² =
  30. 30.82² =
  31. 31.64² =
  32. 32.41² =
  33. 33.99² =
  34. 34.86² =
  35. 35.42² =
  36. 36.34² =
  37. 37.44² =
  38. 38.85² =
  39. 39.72² =
  40. 40.61² =

Answer key

  1. 1369
  2. 4225
  3. 3136
  4. 8281
  5. 7921
  6. 4624
  7. 6889
  8. 2401
  9. 7744
  10. 1521
  11. 5041
  12. 6241
  13. 1849
  14. 7569
  15. 1296
  16. 9604
  17. 1024
  18. 5776
  19. 3364
  20. 8464
  21. 2116
  22. 9025
  23. 2601
  24. 2304
  25. 9216
  26. 2025
  27. 4356
  28. 4761
  29. 2704
  30. 6724
  31. 4096
  32. 1681
  33. 9801
  34. 7396
  35. 1764
  36. 1156
  37. 1936
  38. 7225
  39. 5184
  40. 3721

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