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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 597 · 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. 1.43² =
  2. 2.57² =
  3. 3.55² =
  4. 4.51² =
  5. 5.89² =
  6. 6.59² =
  7. 7.87² =
  8. 8.61² =
  9. 9.66² =
  10. 10.67² =
  11. 11.56² =
  12. 12.63² =
  13. 13.45² =
  14. 14.65² =
  15. 15.94² =
  16. 16.38² =
  17. 17.78² =
  18. 18.75² =
  19. 19.84² =
  20. 20.39² =
  21. 21.88² =
  22. 22.37² =
  23. 23.48² =
  24. 24.86² =
  25. 25.76² =
  26. 26.85² =
  27. 27.81² =
  28. 28.71² =
  29. 29.46² =
  30. 30.54² =
  31. 31.64² =
  32. 32.53² =
  33. 33.98² =
  34. 34.32² =
  35. 35.69² =
  36. 36.49² =
  37. 37.95² =
  38. 38.93² =
  39. 39.91² =
  40. 40.41² =

Answer key

  1. 1849
  2. 3249
  3. 3025
  4. 2601
  5. 7921
  6. 3481
  7. 7569
  8. 3721
  9. 4356
  10. 4489
  11. 3136
  12. 3969
  13. 2025
  14. 4225
  15. 8836
  16. 1444
  17. 6084
  18. 5625
  19. 7056
  20. 1521
  21. 7744
  22. 1369
  23. 2304
  24. 7396
  25. 5776
  26. 7225
  27. 6561
  28. 5041
  29. 2116
  30. 2916
  31. 4096
  32. 2809
  33. 9604
  34. 1024
  35. 4761
  36. 2401
  37. 9025
  38. 8649
  39. 8281
  40. 1681

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