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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 559 · 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. 1.39² =
  2. 2.53² =
  3. 3.65² =
  4. 4.37² =
  5. 5.51² =
  6. 6.99² =
  7. 7.57² =
  8. 8.59² =
  9. 9.85² =
  10. 10.54² =
  11. 11.82² =
  12. 12.66² =
  13. 13.35² =
  14. 14.52² =
  15. 15.87² =
  16. 16.76² =
  17. 17.56² =
  18. 18.77² =
  19. 19.89² =
  20. 20.88² =
  21. 21.97² =
  22. 22.42² =
  23. 23.33² =
  24. 24.79² =
  25. 25.71² =
  26. 26.81² =
  27. 27.47² =
  28. 28.55² =
  29. 29.61² =
  30. 30.43² =
  31. 31.95² =
  32. 32.41² =
  33. 33.44² =
  34. 34.78² =
  35. 35.45² =
  36. 36.48² =
  37. 37.49² =
  38. 38.74² =
  39. 39.91² =
  40. 40.69² =

Answer key

  1. 1521
  2. 2809
  3. 4225
  4. 1369
  5. 2601
  6. 9801
  7. 3249
  8. 3481
  9. 7225
  10. 2916
  11. 6724
  12. 4356
  13. 1225
  14. 2704
  15. 7569
  16. 5776
  17. 3136
  18. 5929
  19. 7921
  20. 7744
  21. 9409
  22. 1764
  23. 1089
  24. 6241
  25. 5041
  26. 6561
  27. 2209
  28. 3025
  29. 3721
  30. 1849
  31. 9025
  32. 1681
  33. 1936
  34. 6084
  35. 2025
  36. 2304
  37. 2401
  38. 5476
  39. 8281
  40. 4761

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