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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 735 · 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. 1.89² =
  2. 2.37² =
  3. 3.61² =
  4. 4.66² =
  5. 5.91² =
  6. 6.57² =
  7. 7.97² =
  8. 8.87² =
  9. 9.92² =
  10. 10.41² =
  11. 11.54² =
  12. 12.72² =
  13. 13.39² =
  14. 14.95² =
  15. 15.68² =
  16. 16.48² =
  17. 17.73² =
  18. 18.64² =
  19. 19.98² =
  20. 20.45² =
  21. 21.88² =
  22. 22.77² =
  23. 23.47² =
  24. 24.56² =
  25. 25.71² =
  26. 26.33² =
  27. 27.42² =
  28. 28.67² =
  29. 29.52² =
  30. 30.78² =
  31. 31.81² =
  32. 32.53² =
  33. 33.79² =
  34. 34.94² =
  35. 35.51² =
  36. 36.38² =
  37. 37.44² =
  38. 38.46² =
  39. 39.32² =
  40. 40.49² =

Answer key

  1. 7921
  2. 1369
  3. 3721
  4. 4356
  5. 8281
  6. 3249
  7. 9409
  8. 7569
  9. 8464
  10. 1681
  11. 2916
  12. 5184
  13. 1521
  14. 9025
  15. 4624
  16. 2304
  17. 5329
  18. 4096
  19. 9604
  20. 2025
  21. 7744
  22. 5929
  23. 2209
  24. 3136
  25. 5041
  26. 1089
  27. 1764
  28. 4489
  29. 2704
  30. 6084
  31. 6561
  32. 2809
  33. 6241
  34. 8836
  35. 2601
  36. 1444
  37. 1936
  38. 2116
  39. 1024
  40. 2401

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