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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 399 · 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. 1.48² =
  2. 2.39² =
  3. 3.81² =
  4. 4.61² =
  5. 5.86² =
  6. 6.91² =
  7. 7.52² =
  8. 8.33² =
  9. 9.67² =
  10. 10.41² =
  11. 11.51² =
  12. 12.35² =
  13. 13.47² =
  14. 14.77² =
  15. 15.45² =
  16. 16.66² =
  17. 17.89² =
  18. 18.54² =
  19. 19.64² =
  20. 20.46² =
  21. 21.76² =
  22. 22.74² =
  23. 23.38² =
  24. 24.75² =
  25. 25.65² =
  26. 26.32² =
  27. 27.78² =
  28. 28.37² =
  29. 29.57² =
  30. 30.59² =
  31. 31.93² =
  32. 32.79² =
  33. 33.82² =
  34. 34.69² =
  35. 35.94² =
  36. 36.36² =
  37. 37.87² =
  38. 38.83² =
  39. 39.58² =
  40. 40.99² =

Answer key

  1. 2304
  2. 1521
  3. 6561
  4. 3721
  5. 7396
  6. 8281
  7. 2704
  8. 1089
  9. 4489
  10. 1681
  11. 2601
  12. 1225
  13. 2209
  14. 5929
  15. 2025
  16. 4356
  17. 7921
  18. 2916
  19. 4096
  20. 2116
  21. 5776
  22. 5476
  23. 1444
  24. 5625
  25. 4225
  26. 1024
  27. 6084
  28. 1369
  29. 3249
  30. 3481
  31. 8649
  32. 6241
  33. 6724
  34. 4761
  35. 8836
  36. 1296
  37. 7569
  38. 6889
  39. 3364
  40. 9801

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