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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 442 · 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. 1.72² =
  2. 2.61² =
  3. 3.33² =
  4. 4.81² =
  5. 5.98² =
  6. 6.96² =
  7. 7.85² =
  8. 8.86² =
  9. 9.62² =
  10. 10.39² =
  11. 11.91² =
  12. 12.78² =
  13. 13.64² =
  14. 14.51² =
  15. 15.44² =
  16. 16.79² =
  17. 17.83² =
  18. 18.42² =
  19. 19.63² =
  20. 20.58² =
  21. 21.41² =
  22. 22.94² =
  23. 23.52² =
  24. 24.99² =
  25. 25.69² =
  26. 26.73² =
  27. 27.48² =
  28. 28.31² =
  29. 29.38² =
  30. 30.76² =
  31. 31.82² =
  32. 32.88² =
  33. 33.53² =
  34. 34.74² =
  35. 35.67² =
  36. 36.89² =
  37. 37.75² =
  38. 38.32² =
  39. 39.55² =
  40. 40.87² =

Answer key

  1. 5184
  2. 3721
  3. 1089
  4. 6561
  5. 9604
  6. 9216
  7. 7225
  8. 7396
  9. 3844
  10. 1521
  11. 8281
  12. 6084
  13. 4096
  14. 2601
  15. 1936
  16. 6241
  17. 6889
  18. 1764
  19. 3969
  20. 3364
  21. 1681
  22. 8836
  23. 2704
  24. 9801
  25. 4761
  26. 5329
  27. 2304
  28. 961
  29. 1444
  30. 5776
  31. 6724
  32. 7744
  33. 2809
  34. 5476
  35. 4489
  36. 7921
  37. 5625
  38. 1024
  39. 3025
  40. 7569

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