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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 31 · 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. 1.37² =
  2. 2.95² =
  3. 3.88² =
  4. 4.69² =
  5. 5.53² =
  6. 6.72² =
  7. 7.68² =
  8. 8.66² =
  9. 9.71² =
  10. 10.35² =
  11. 11.48² =
  12. 12.49² =
  13. 13.47² =
  14. 14.62² =
  15. 15.61² =
  16. 16.91² =
  17. 17.82² =
  18. 18.65² =
  19. 19.41² =
  20. 20.98² =
  21. 21.32² =
  22. 22.81² =
  23. 23.77² =
  24. 24.78² =
  25. 25.58² =
  26. 26.44² =
  27. 27.93² =
  28. 28.46² =
  29. 29.63² =
  30. 30.67² =
  31. 31.96² =
  32. 32.74² =
  33. 33.51² =
  34. 34.42² =
  35. 35.99² =
  36. 36.39² =
  37. 37.86² =
  38. 38.83² =
  39. 39.43² =
  40. 40.97² =

Answer key

  1. 1369
  2. 9025
  3. 7744
  4. 4761
  5. 2809
  6. 5184
  7. 4624
  8. 4356
  9. 5041
  10. 1225
  11. 2304
  12. 2401
  13. 2209
  14. 3844
  15. 3721
  16. 8281
  17. 6724
  18. 4225
  19. 1681
  20. 9604
  21. 1024
  22. 6561
  23. 5929
  24. 6084
  25. 3364
  26. 1936
  27. 8649
  28. 2116
  29. 3969
  30. 4489
  31. 9216
  32. 5476
  33. 2601
  34. 1764
  35. 9801
  36. 1521
  37. 7396
  38. 6889
  39. 1849
  40. 9409

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