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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 666 · 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. 1.39² =
  2. 2.45² =
  3. 3.51² =
  4. 4.84² =
  5. 5.33² =
  6. 6.96² =
  7. 7.94² =
  8. 8.56² =
  9. 9.81² =
  10. 10.61² =
  11. 11.46² =
  12. 12.34² =
  13. 13.75² =
  14. 14.38² =
  15. 15.44² =
  16. 16.68² =
  17. 17.43² =
  18. 18.93² =
  19. 19.63² =
  20. 20.76² =
  21. 21.64² =
  22. 22.41² =
  23. 23.85² =
  24. 24.97² =
  25. 25.83² =
  26. 26.78² =
  27. 27.92² =
  28. 28.79² =
  29. 29.91² =
  30. 30.31² =
  31. 31.86² =
  32. 32.88² =
  33. 33.49² =
  34. 34.98² =
  35. 35.82² =
  36. 36.48² =
  37. 37.66² =
  38. 38.95² =
  39. 39.55² =
  40. 40.54² =

Answer key

  1. 1521
  2. 2025
  3. 2601
  4. 7056
  5. 1089
  6. 9216
  7. 8836
  8. 3136
  9. 6561
  10. 3721
  11. 2116
  12. 1156
  13. 5625
  14. 1444
  15. 1936
  16. 4624
  17. 1849
  18. 8649
  19. 3969
  20. 5776
  21. 4096
  22. 1681
  23. 7225
  24. 9409
  25. 6889
  26. 6084
  27. 8464
  28. 6241
  29. 8281
  30. 961
  31. 7396
  32. 7744
  33. 2401
  34. 9604
  35. 6724
  36. 2304
  37. 4356
  38. 9025
  39. 3025
  40. 2916

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