← 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 190 · 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. 1.94² =
  2. 2.75² =
  3. 3.63² =
  4. 4.71² =
  5. 5.98² =
  6. 6.87² =
  7. 7.51² =
  8. 8.89² =
  9. 9.56² =
  10. 10.32² =
  11. 11.45² =
  12. 12.84² =
  13. 13.41² =
  14. 14.62² =
  15. 15.76² =
  16. 16.54² =
  17. 17.43² =
  18. 18.64² =
  19. 19.57² =
  20. 20.81² =
  21. 21.46² =
  22. 22.48² =
  23. 23.91² =
  24. 24.66² =
  25. 25.39² =
  26. 26.49² =
  27. 27.68² =
  28. 28.47² =
  29. 29.37² =
  30. 30.92² =
  31. 31.35² =
  32. 32.97² =
  33. 33.82² =
  34. 34.33² =
  35. 35.67² =
  36. 36.86² =
  37. 37.55² =
  38. 38.31² =
  39. 39.69² =
  40. 40.79² =

Answer key

  1. 8836
  2. 5625
  3. 3969
  4. 5041
  5. 9604
  6. 7569
  7. 2601
  8. 7921
  9. 3136
  10. 1024
  11. 2025
  12. 7056
  13. 1681
  14. 3844
  15. 5776
  16. 2916
  17. 1849
  18. 4096
  19. 3249
  20. 6561
  21. 2116
  22. 2304
  23. 8281
  24. 4356
  25. 1521
  26. 2401
  27. 4624
  28. 2209
  29. 1369
  30. 8464
  31. 1225
  32. 9409
  33. 6724
  34. 1089
  35. 4489
  36. 7396
  37. 3025
  38. 961
  39. 4761
  40. 6241

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