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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 750 · 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. 1.95² =
  2. 2.67² =
  3. 3.58² =
  4. 4.64² =
  5. 5.94² =
  6. 6.42² =
  7. 7.68² =
  8. 8.78² =
  9. 9.82² =
  10. 10.71² =
  11. 11.33² =
  12. 12.92² =
  13. 13.55² =
  14. 14.91² =
  15. 15.66² =
  16. 16.39² =
  17. 17.84² =
  18. 18.57² =
  19. 19.81² =
  20. 20.93² =
  21. 21.34² =
  22. 22.65² =
  23. 23.41² =
  24. 24.89² =
  25. 25.52² =
  26. 26.49² =
  27. 27.45² =
  28. 28.99² =
  29. 29.54² =
  30. 30.88² =
  31. 31.69² =
  32. 32.35² =
  33. 33.98² =
  34. 34.36² =
  35. 35.43² =
  36. 36.51² =
  37. 37.37² =
  38. 38.61² =
  39. 39.63² =
  40. 40.44² =

Answer key

  1. 9025
  2. 4489
  3. 3364
  4. 4096
  5. 8836
  6. 1764
  7. 4624
  8. 6084
  9. 6724
  10. 5041
  11. 1089
  12. 8464
  13. 3025
  14. 8281
  15. 4356
  16. 1521
  17. 7056
  18. 3249
  19. 6561
  20. 8649
  21. 1156
  22. 4225
  23. 1681
  24. 7921
  25. 2704
  26. 2401
  27. 2025
  28. 9801
  29. 2916
  30. 7744
  31. 4761
  32. 1225
  33. 9604
  34. 1296
  35. 1849
  36. 2601
  37. 1369
  38. 3721
  39. 3969
  40. 1936

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