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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 685 · 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. 1.91² =
  2. 2.34² =
  3. 3.61² =
  4. 4.77² =
  5. 5.72² =
  6. 6.81² =
  7. 7.63² =
  8. 8.87² =
  9. 9.47² =
  10. 10.75² =
  11. 11.98² =
  12. 12.78² =
  13. 13.51² =
  14. 14.71² =
  15. 15.59² =
  16. 16.33² =
  17. 17.55² =
  18. 18.95² =
  19. 19.48² =
  20. 20.68² =
  21. 21.52² =
  22. 22.41² =
  23. 23.43² =
  24. 24.31² =
  25. 25.76² =
  26. 26.46² =
  27. 27.79² =
  28. 28.32² =
  29. 29.74² =
  30. 30.58² =
  31. 31.88² =
  32. 32.64² =
  33. 33.86² =
  34. 34.39² =
  35. 35.69² =
  36. 36.99² =
  37. 37.38² =
  38. 38.54² =
  39. 39.97² =
  40. 40.44² =

Answer key

  1. 8281
  2. 1156
  3. 3721
  4. 5929
  5. 5184
  6. 6561
  7. 3969
  8. 7569
  9. 2209
  10. 5625
  11. 9604
  12. 6084
  13. 2601
  14. 5041
  15. 3481
  16. 1089
  17. 3025
  18. 9025
  19. 2304
  20. 4624
  21. 2704
  22. 1681
  23. 1849
  24. 961
  25. 5776
  26. 2116
  27. 6241
  28. 1024
  29. 5476
  30. 3364
  31. 7744
  32. 4096
  33. 7396
  34. 1521
  35. 4761
  36. 9801
  37. 1444
  38. 2916
  39. 9409
  40. 1936

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