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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 497 · 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. 2.77² =
  3. 3.84² =
  4. 4.61² =
  5. 5.75² =
  6. 6.37² =
  7. 7.68² =
  8. 8.58² =
  9. 9.95² =
  10. 10.47² =
  11. 11.64² =
  12. 12.99² =
  13. 13.83² =
  14. 14.38² =
  15. 15.46² =
  16. 16.49² =
  17. 17.91² =
  18. 18.33² =
  19. 19.85² =
  20. 20.39² =
  21. 21.32² =
  22. 22.54² =
  23. 23.63² =
  24. 24.86² =
  25. 25.55² =
  26. 26.72² =
  27. 27.65² =
  28. 28.48² =
  29. 29.51² =
  30. 30.71² =
  31. 31.42² =
  32. 32.97² =
  33. 33.45² =
  34. 34.79² =
  35. 35.78² =
  36. 36.98² =
  37. 37.44² =
  38. 38.41² =
  39. 39.66² =
  40. 40.92² =

Answer key

  1. 9216
  2. 5929
  3. 7056
  4. 3721
  5. 5625
  6. 1369
  7. 4624
  8. 3364
  9. 9025
  10. 2209
  11. 4096
  12. 9801
  13. 6889
  14. 1444
  15. 2116
  16. 2401
  17. 8281
  18. 1089
  19. 7225
  20. 1521
  21. 1024
  22. 2916
  23. 3969
  24. 7396
  25. 3025
  26. 5184
  27. 4225
  28. 2304
  29. 2601
  30. 5041
  31. 1764
  32. 9409
  33. 2025
  34. 6241
  35. 6084
  36. 9604
  37. 1936
  38. 1681
  39. 4356
  40. 8464

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