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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 282 · 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. 1.71² =
  2. 2.72² =
  3. 3.96² =
  4. 4.99² =
  5. 5.35² =
  6. 6.97² =
  7. 7.33² =
  8. 8.81² =
  9. 9.51² =
  10. 10.83² =
  11. 11.77² =
  12. 12.94² =
  13. 13.59² =
  14. 14.76² =
  15. 15.39² =
  16. 16.49² =
  17. 17.67² =
  18. 18.45² =
  19. 19.37² =
  20. 20.44² =
  21. 21.89² =
  22. 22.53² =
  23. 23.48² =
  24. 24.65² =
  25. 25.43² =
  26. 26.31² =
  27. 27.79² =
  28. 28.61² =
  29. 29.86² =
  30. 30.78² =
  31. 31.69² =
  32. 32.64² =
  33. 33.32² =
  34. 34.93² =
  35. 35.47² =
  36. 36.88² =
  37. 37.68² =
  38. 38.87² =
  39. 39.34² =
  40. 40.41² =

Answer key

  1. 5041
  2. 5184
  3. 9216
  4. 9801
  5. 1225
  6. 9409
  7. 1089
  8. 6561
  9. 2601
  10. 6889
  11. 5929
  12. 8836
  13. 3481
  14. 5776
  15. 1521
  16. 2401
  17. 4489
  18. 2025
  19. 1369
  20. 1936
  21. 7921
  22. 2809
  23. 2304
  24. 4225
  25. 1849
  26. 961
  27. 6241
  28. 3721
  29. 7396
  30. 6084
  31. 4761
  32. 4096
  33. 1024
  34. 8649
  35. 2209
  36. 7744
  37. 4624
  38. 7569
  39. 1156
  40. 1681

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