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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 254 · 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. 1.91² =
  2. 2.32² =
  3. 3.65² =
  4. 4.76² =
  5. 5.83² =
  6. 6.75² =
  7. 7.43² =
  8. 8.56² =
  9. 9.86² =
  10. 10.73² =
  11. 11.71² =
  12. 12.47² =
  13. 13.79² =
  14. 14.62² =
  15. 15.33² =
  16. 16.82² =
  17. 17.89² =
  18. 18.67² =
  19. 19.51² =
  20. 20.66² =
  21. 21.44² =
  22. 22.46² =
  23. 23.38² =
  24. 24.94² =
  25. 25.84² =
  26. 26.98² =
  27. 27.52² =
  28. 28.78² =
  29. 29.74² =
  30. 30.99² =
  31. 31.39² =
  32. 32.88² =
  33. 33.81² =
  34. 34.61² =
  35. 35.55² =
  36. 36.93² =
  37. 37.45² =
  38. 38.77² =
  39. 39.48² =
  40. 40.72² =

Answer key

  1. 8281
  2. 1024
  3. 4225
  4. 5776
  5. 6889
  6. 5625
  7. 1849
  8. 3136
  9. 7396
  10. 5329
  11. 5041
  12. 2209
  13. 6241
  14. 3844
  15. 1089
  16. 6724
  17. 7921
  18. 4489
  19. 2601
  20. 4356
  21. 1936
  22. 2116
  23. 1444
  24. 8836
  25. 7056
  26. 9604
  27. 2704
  28. 6084
  29. 5476
  30. 9801
  31. 1521
  32. 7744
  33. 6561
  34. 3721
  35. 3025
  36. 8649
  37. 2025
  38. 5929
  39. 2304
  40. 5184

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