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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 525 · 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. 1.99² =
  2. 2.75² =
  3. 3.97² =
  4. 4.72² =
  5. 5.36² =
  6. 6.37² =
  7. 7.77² =
  8. 8.96² =
  9. 9.78² =
  10. 10.57² =
  11. 11.45² =
  12. 12.51² =
  13. 13.69² =
  14. 14.61² =
  15. 15.66² =
  16. 16.31² =
  17. 17.73² =
  18. 18.81² =
  19. 19.67² =
  20. 20.38² =
  21. 21.33² =
  22. 22.71² =
  23. 23.88² =
  24. 24.68² =
  25. 25.47² =
  26. 26.48² =
  27. 27.58² =
  28. 28.49² =
  29. 29.83² =
  30. 30.84² =
  31. 31.89² =
  32. 32.39² =
  33. 33.41² =
  34. 34.85² =
  35. 35.98² =
  36. 36.95² =
  37. 37.55² =
  38. 38.64² =
  39. 39.91² =
  40. 40.32² =

Answer key

  1. 9801
  2. 5625
  3. 9409
  4. 5184
  5. 1296
  6. 1369
  7. 5929
  8. 9216
  9. 6084
  10. 3249
  11. 2025
  12. 2601
  13. 4761
  14. 3721
  15. 4356
  16. 961
  17. 5329
  18. 6561
  19. 4489
  20. 1444
  21. 1089
  22. 5041
  23. 7744
  24. 4624
  25. 2209
  26. 2304
  27. 3364
  28. 2401
  29. 6889
  30. 7056
  31. 7921
  32. 1521
  33. 1681
  34. 7225
  35. 9604
  36. 9025
  37. 3025
  38. 4096
  39. 8281
  40. 1024

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