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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 336 · 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. 1.53² =
  2. 2.71² =
  3. 3.66² =
  4. 4.69² =
  5. 5.87² =
  6. 6.46² =
  7. 7.89² =
  8. 8.37² =
  9. 9.55² =
  10. 10.34² =
  11. 11.88² =
  12. 12.59² =
  13. 13.39² =
  14. 14.83² =
  15. 15.63² =
  16. 16.94² =
  17. 17.51² =
  18. 18.67² =
  19. 19.76² =
  20. 20.33² =
  21. 21.95² =
  22. 22.64² =
  23. 23.93² =
  24. 24.41² =
  25. 25.58² =
  26. 26.92² =
  27. 27.31² =
  28. 28.73² =
  29. 29.74² =
  30. 30.97² =
  31. 31.48² =
  32. 32.52² =
  33. 33.86² =
  34. 34.99² =
  35. 35.61² =
  36. 36.38² =
  37. 37.79² =
  38. 38.72² =
  39. 39.42² =
  40. 40.77² =

Answer key

  1. 2809
  2. 5041
  3. 4356
  4. 4761
  5. 7569
  6. 2116
  7. 7921
  8. 1369
  9. 3025
  10. 1156
  11. 7744
  12. 3481
  13. 1521
  14. 6889
  15. 3969
  16. 8836
  17. 2601
  18. 4489
  19. 5776
  20. 1089
  21. 9025
  22. 4096
  23. 8649
  24. 1681
  25. 3364
  26. 8464
  27. 961
  28. 5329
  29. 5476
  30. 9409
  31. 2304
  32. 2704
  33. 7396
  34. 9801
  35. 3721
  36. 1444
  37. 6241
  38. 5184
  39. 1764
  40. 5929

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