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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 717 · 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. 1.96² =
  2. 2.91² =
  3. 3.37² =
  4. 4.81² =
  5. 5.99² =
  6. 6.47² =
  7. 7.62² =
  8. 8.97² =
  9. 9.78² =
  10. 10.67² =
  11. 11.44² =
  12. 12.34² =
  13. 13.64² =
  14. 14.33² =
  15. 15.92² =
  16. 16.59² =
  17. 17.66² =
  18. 18.46² =
  19. 19.89² =
  20. 20.36² =
  21. 21.85² =
  22. 22.82² =
  23. 23.95² =
  24. 24.49² =
  25. 25.71² =
  26. 26.68² =
  27. 27.79² =
  28. 28.87² =
  29. 29.53² =
  30. 30.69² =
  31. 31.45² =
  32. 32.93² =
  33. 33.52² =
  34. 34.51² =
  35. 35.54² =
  36. 36.88² =
  37. 37.41² =
  38. 38.63² =
  39. 39.75² =
  40. 40.35² =

Answer key

  1. 9216
  2. 8281
  3. 1369
  4. 6561
  5. 9801
  6. 2209
  7. 3844
  8. 9409
  9. 6084
  10. 4489
  11. 1936
  12. 1156
  13. 4096
  14. 1089
  15. 8464
  16. 3481
  17. 4356
  18. 2116
  19. 7921
  20. 1296
  21. 7225
  22. 6724
  23. 9025
  24. 2401
  25. 5041
  26. 4624
  27. 6241
  28. 7569
  29. 2809
  30. 4761
  31. 2025
  32. 8649
  33. 2704
  34. 2601
  35. 2916
  36. 7744
  37. 1681
  38. 3969
  39. 5625
  40. 1225

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