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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 558 · 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. 1.58² =
  2. 2.53² =
  3. 3.98² =
  4. 4.31² =
  5. 5.62² =
  6. 6.38² =
  7. 7.81² =
  8. 8.97² =
  9. 9.66² =
  10. 10.79² =
  11. 11.95² =
  12. 12.84² =
  13. 13.41² =
  14. 14.44² =
  15. 15.35² =
  16. 16.57² =
  17. 17.56² =
  18. 18.77² =
  19. 19.52² =
  20. 20.32² =
  21. 21.78² =
  22. 22.42² =
  23. 23.51² =
  24. 24.59² =
  25. 25.75² =
  26. 26.71² =
  27. 27.65² =
  28. 28.54² =
  29. 29.61² =
  30. 30.72² =
  31. 31.82² =
  32. 32.55² =
  33. 33.92² =
  34. 34.94² =
  35. 35.33² =
  36. 36.74² =
  37. 37.43² =
  38. 38.91² =
  39. 39.47² =
  40. 40.86² =

Answer key

  1. 3364
  2. 2809
  3. 9604
  4. 961
  5. 3844
  6. 1444
  7. 6561
  8. 9409
  9. 4356
  10. 6241
  11. 9025
  12. 7056
  13. 1681
  14. 1936
  15. 1225
  16. 3249
  17. 3136
  18. 5929
  19. 2704
  20. 1024
  21. 6084
  22. 1764
  23. 2601
  24. 3481
  25. 5625
  26. 5041
  27. 4225
  28. 2916
  29. 3721
  30. 5184
  31. 6724
  32. 3025
  33. 8464
  34. 8836
  35. 1089
  36. 5476
  37. 1849
  38. 8281
  39. 2209
  40. 7396

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