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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 584 · 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. 1.65² =
  2. 2.74² =
  3. 3.62² =
  4. 4.37² =
  5. 5.95² =
  6. 6.47² =
  7. 7.55² =
  8. 8.72² =
  9. 9.76² =
  10. 10.63² =
  11. 11.31² =
  12. 12.92² =
  13. 13.43² =
  14. 14.86² =
  15. 15.66² =
  16. 16.39² =
  17. 17.82² =
  18. 18.84² =
  19. 19.85² =
  20. 20.51² =
  21. 21.59² =
  22. 22.68² =
  23. 23.67² =
  24. 24.56² =
  25. 25.41² =
  26. 26.44² =
  27. 27.53² =
  28. 28.83² =
  29. 29.52² =
  30. 30.35² =
  31. 31.97² =
  32. 32.88² =
  33. 33.89² =
  34. 34.69² =
  35. 35.45² =
  36. 36.48² =
  37. 37.77² =
  38. 38.32² =
  39. 39.38² =
  40. 40.98² =

Answer key

  1. 4225
  2. 5476
  3. 3844
  4. 1369
  5. 9025
  6. 2209
  7. 3025
  8. 5184
  9. 5776
  10. 3969
  11. 961
  12. 8464
  13. 1849
  14. 7396
  15. 4356
  16. 1521
  17. 6724
  18. 7056
  19. 7225
  20. 2601
  21. 3481
  22. 4624
  23. 4489
  24. 3136
  25. 1681
  26. 1936
  27. 2809
  28. 6889
  29. 2704
  30. 1225
  31. 9409
  32. 7744
  33. 7921
  34. 4761
  35. 2025
  36. 2304
  37. 5929
  38. 1024
  39. 1444
  40. 9604

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