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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 185 · 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. 2.37² =
  3. 3.35² =
  4. 4.96² =
  5. 5.77² =
  6. 6.72² =
  7. 7.81² =
  8. 8.59² =
  9. 9.39² =
  10. 10.65² =
  11. 11.44² =
  12. 12.88² =
  13. 13.55² =
  14. 14.49² =
  15. 15.92² =
  16. 16.73² =
  17. 17.64² =
  18. 18.33² =
  19. 19.51² =
  20. 20.66² =
  21. 21.45² =
  22. 22.93² =
  23. 23.54² =
  24. 24.63² =
  25. 25.34² =
  26. 26.74² =
  27. 27.61² =
  28. 28.78² =
  29. 29.38² =
  30. 30.31² =
  31. 31.71² =
  32. 32.98² =
  33. 33.52² =
  34. 34.97² =
  35. 35.79² =
  36. 36.86² =
  37. 37.67² =
  38. 38.89² =
  39. 39.94² =
  40. 40.48² =

Answer key

  1. 9025
  2. 1369
  3. 1225
  4. 9216
  5. 5929
  6. 5184
  7. 6561
  8. 3481
  9. 1521
  10. 4225
  11. 1936
  12. 7744
  13. 3025
  14. 2401
  15. 8464
  16. 5329
  17. 4096
  18. 1089
  19. 2601
  20. 4356
  21. 2025
  22. 8649
  23. 2916
  24. 3969
  25. 1156
  26. 5476
  27. 3721
  28. 6084
  29. 1444
  30. 961
  31. 5041
  32. 9604
  33. 2704
  34. 9409
  35. 6241
  36. 7396
  37. 4489
  38. 7921
  39. 8836
  40. 2304

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