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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 509 · 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. 1.95² =
  2. 2.59² =
  3. 3.34² =
  4. 4.71² =
  5. 5.94² =
  6. 6.52² =
  7. 7.81² =
  8. 8.91² =
  9. 9.44² =
  10. 10.83² =
  11. 11.49² =
  12. 12.65² =
  13. 13.66² =
  14. 14.78² =
  15. 15.88² =
  16. 16.84² =
  17. 17.58² =
  18. 18.96² =
  19. 19.67² =
  20. 20.89² =
  21. 21.85² =
  22. 22.48² =
  23. 23.87² =
  24. 24.97² =
  25. 25.64² =
  26. 26.75² =
  27. 27.51² =
  28. 28.38² =
  29. 29.92² =
  30. 30.82² =
  31. 31.63² =
  32. 32.72² =
  33. 33.61² =
  34. 34.79² =
  35. 35.45² =
  36. 36.55² =
  37. 37.93² =
  38. 38.41² =
  39. 39.68² =
  40. 40.31² =

Answer key

  1. 9025
  2. 3481
  3. 1156
  4. 5041
  5. 8836
  6. 2704
  7. 6561
  8. 8281
  9. 1936
  10. 6889
  11. 2401
  12. 4225
  13. 4356
  14. 6084
  15. 7744
  16. 7056
  17. 3364
  18. 9216
  19. 4489
  20. 7921
  21. 7225
  22. 2304
  23. 7569
  24. 9409
  25. 4096
  26. 5625
  27. 2601
  28. 1444
  29. 8464
  30. 6724
  31. 3969
  32. 5184
  33. 3721
  34. 6241
  35. 2025
  36. 3025
  37. 8649
  38. 1681
  39. 4624
  40. 961

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