← 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 46 · 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. 1.35² =
  2. 2.72² =
  3. 3.51² =
  4. 4.41² =
  5. 5.88² =
  6. 6.71² =
  7. 7.48² =
  8. 8.46² =
  9. 9.69² =
  10. 10.47² =
  11. 11.74² =
  12. 12.83² =
  13. 13.38² =
  14. 14.81² =
  15. 15.98² =
  16. 16.62² =
  17. 17.94² =
  18. 18.45² =
  19. 19.97² =
  20. 20.42² =
  21. 21.61² =
  22. 22.56² =
  23. 23.37² =
  24. 24.96² =
  25. 25.39² =
  26. 26.79² =
  27. 27.68² =
  28. 28.59² =
  29. 29.78² =
  30. 30.44² =
  31. 31.32² =
  32. 32.52² =
  33. 33.93² =
  34. 34.76² =
  35. 35.64² =
  36. 36.58² =
  37. 37.92² =
  38. 38.82² =
  39. 39.63² =
  40. 40.53² =

Answer key

  1. 1225
  2. 5184
  3. 2601
  4. 1681
  5. 7744
  6. 5041
  7. 2304
  8. 2116
  9. 4761
  10. 2209
  11. 5476
  12. 6889
  13. 1444
  14. 6561
  15. 9604
  16. 3844
  17. 8836
  18. 2025
  19. 9409
  20. 1764
  21. 3721
  22. 3136
  23. 1369
  24. 9216
  25. 1521
  26. 6241
  27. 4624
  28. 3481
  29. 6084
  30. 1936
  31. 1024
  32. 2704
  33. 8649
  34. 5776
  35. 4096
  36. 3364
  37. 8464
  38. 6724
  39. 3969
  40. 2809

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