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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 417 · 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. 1.51² =
  2. 2.55² =
  3. 3.52² =
  4. 4.32² =
  5. 5.64² =
  6. 6.77² =
  7. 7.81² =
  8. 8.91² =
  9. 9.39² =
  10. 10.48² =
  11. 11.43² =
  12. 12.44² =
  13. 13.33² =
  14. 14.34² =
  15. 15.72² =
  16. 16.61² =
  17. 17.97² =
  18. 18.31² =
  19. 19.41² =
  20. 20.89² =
  21. 21.82² =
  22. 22.46² =
  23. 23.73² =
  24. 24.79² =
  25. 25.42² =
  26. 26.75² =
  27. 27.66² =
  28. 28.69² =
  29. 29.88² =
  30. 30.35² =
  31. 31.71² =
  32. 32.68² =
  33. 33.37² =
  34. 34.45² =
  35. 35.38² =
  36. 36.85² =
  37. 37.47² =
  38. 38.74² =
  39. 39.99² =
  40. 40.36² =

Answer key

  1. 2601
  2. 3025
  3. 2704
  4. 1024
  5. 4096
  6. 5929
  7. 6561
  8. 8281
  9. 1521
  10. 2304
  11. 1849
  12. 1936
  13. 1089
  14. 1156
  15. 5184
  16. 3721
  17. 9409
  18. 961
  19. 1681
  20. 7921
  21. 6724
  22. 2116
  23. 5329
  24. 6241
  25. 1764
  26. 5625
  27. 4356
  28. 4761
  29. 7744
  30. 1225
  31. 5041
  32. 4624
  33. 1369
  34. 2025
  35. 1444
  36. 7225
  37. 2209
  38. 5476
  39. 9801
  40. 1296

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