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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 704 · 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. 1.86² =
  2. 2.38² =
  3. 3.34² =
  4. 4.69² =
  5. 5.44² =
  6. 6.63² =
  7. 7.35² =
  8. 8.71² =
  9. 9.51² =
  10. 10.57² =
  11. 11.66² =
  12. 12.91² =
  13. 13.55² =
  14. 14.68² =
  15. 15.48² =
  16. 16.31² =
  17. 17.41² =
  18. 18.79² =
  19. 19.76² =
  20. 20.65² =
  21. 21.89² =
  22. 22.43² =
  23. 23.37² =
  24. 24.81² =
  25. 25.45² =
  26. 26.59² =
  27. 27.93² =
  28. 28.74² =
  29. 29.33² =
  30. 30.94² =
  31. 31.64² =
  32. 32.56² =
  33. 33.46² =
  34. 34.49² =
  35. 35.95² =
  36. 36.97² =
  37. 37.53² =
  38. 38.67² =
  39. 39.42² =
  40. 40.98² =

Answer key

  1. 7396
  2. 1444
  3. 1156
  4. 4761
  5. 1936
  6. 3969
  7. 1225
  8. 5041
  9. 2601
  10. 3249
  11. 4356
  12. 8281
  13. 3025
  14. 4624
  15. 2304
  16. 961
  17. 1681
  18. 6241
  19. 5776
  20. 4225
  21. 7921
  22. 1849
  23. 1369
  24. 6561
  25. 2025
  26. 3481
  27. 8649
  28. 5476
  29. 1089
  30. 8836
  31. 4096
  32. 3136
  33. 2116
  34. 2401
  35. 9025
  36. 9409
  37. 2809
  38. 4489
  39. 1764
  40. 9604

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