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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 453 · 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. 1.72² =
  2. 2.39² =
  3. 3.61² =
  4. 4.67² =
  5. 5.31² =
  6. 6.78² =
  7. 7.44² =
  8. 8.87² =
  9. 9.91² =
  10. 10.32² =
  11. 11.89² =
  12. 12.93² =
  13. 13.45² =
  14. 14.37² =
  15. 15.52² =
  16. 16.84² =
  17. 17.63² =
  18. 18.57² =
  19. 19.81² =
  20. 20.71² =
  21. 21.98² =
  22. 22.75² =
  23. 23.48² =
  24. 24.41² =
  25. 25.54² =
  26. 26.46² =
  27. 27.51² =
  28. 28.85² =
  29. 29.42² =
  30. 30.66² =
  31. 31.53² =
  32. 32.69² =
  33. 33.34² =
  34. 34.49² =
  35. 35.33² =
  36. 36.92² =
  37. 37.97² =
  38. 38.56² =
  39. 39.55² =
  40. 40.76² =

Answer key

  1. 5184
  2. 1521
  3. 3721
  4. 4489
  5. 961
  6. 6084
  7. 1936
  8. 7569
  9. 8281
  10. 1024
  11. 7921
  12. 8649
  13. 2025
  14. 1369
  15. 2704
  16. 7056
  17. 3969
  18. 3249
  19. 6561
  20. 5041
  21. 9604
  22. 5625
  23. 2304
  24. 1681
  25. 2916
  26. 2116
  27. 2601
  28. 7225
  29. 1764
  30. 4356
  31. 2809
  32. 4761
  33. 1156
  34. 2401
  35. 1089
  36. 8464
  37. 9409
  38. 3136
  39. 3025
  40. 5776

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