← 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 229 · 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. 1.38² =
  2. 2.51² =
  3. 3.59² =
  4. 4.41² =
  5. 5.89² =
  6. 6.78² =
  7. 7.83² =
  8. 8.52² =
  9. 9.65² =
  10. 10.67² =
  11. 11.43² =
  12. 12.48² =
  13. 13.63² =
  14. 14.34² =
  15. 15.44² =
  16. 16.74² =
  17. 17.68² =
  18. 18.76² =
  19. 19.36² =
  20. 20.31² =
  21. 21.37² =
  22. 22.61² =
  23. 23.64² =
  24. 24.82² =
  25. 25.97² =
  26. 26.42² =
  27. 27.62² =
  28. 28.96² =
  29. 29.99² =
  30. 30.66² =
  31. 31.71² =
  32. 32.85² =
  33. 33.58² =
  34. 34.33² =
  35. 35.79² =
  36. 36.47² =
  37. 37.98² =
  38. 38.39² =
  39. 39.55² =
  40. 40.69² =

Answer key

  1. 1444
  2. 2601
  3. 3481
  4. 1681
  5. 7921
  6. 6084
  7. 6889
  8. 2704
  9. 4225
  10. 4489
  11. 1849
  12. 2304
  13. 3969
  14. 1156
  15. 1936
  16. 5476
  17. 4624
  18. 5776
  19. 1296
  20. 961
  21. 1369
  22. 3721
  23. 4096
  24. 6724
  25. 9409
  26. 1764
  27. 3844
  28. 9216
  29. 9801
  30. 4356
  31. 5041
  32. 7225
  33. 3364
  34. 1089
  35. 6241
  36. 2209
  37. 9604
  38. 1521
  39. 3025
  40. 4761

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