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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 759 · 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. 1.73² =
  2. 2.39² =
  3. 3.56² =
  4. 4.32² =
  5. 5.44² =
  6. 6.51² =
  7. 7.55² =
  8. 8.98² =
  9. 9.81² =
  10. 10.31² =
  11. 11.41² =
  12. 12.68² =
  13. 13.59² =
  14. 14.75² =
  15. 15.54² =
  16. 16.47² =
  17. 17.79² =
  18. 18.58² =
  19. 19.48² =
  20. 20.37² =
  21. 21.57² =
  22. 22.97² =
  23. 23.94² =
  24. 24.67² =
  25. 25.91² =
  26. 26.34² =
  27. 27.45² =
  28. 28.49² =
  29. 29.43² =
  30. 30.78² =
  31. 31.95² =
  32. 32.61² =
  33. 33.63² =
  34. 34.89² =
  35. 35.84² =
  36. 36.82² =
  37. 37.93² =
  38. 38.92² =
  39. 39.69² =
  40. 40.99² =

Answer key

  1. 5329
  2. 1521
  3. 3136
  4. 1024
  5. 1936
  6. 2601
  7. 3025
  8. 9604
  9. 6561
  10. 961
  11. 1681
  12. 4624
  13. 3481
  14. 5625
  15. 2916
  16. 2209
  17. 6241
  18. 3364
  19. 2304
  20. 1369
  21. 3249
  22. 9409
  23. 8836
  24. 4489
  25. 8281
  26. 1156
  27. 2025
  28. 2401
  29. 1849
  30. 6084
  31. 9025
  32. 3721
  33. 3969
  34. 7921
  35. 7056
  36. 6724
  37. 8649
  38. 8464
  39. 4761
  40. 9801

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