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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 425 · 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. 1.57² =
  2. 2.44² =
  3. 3.33² =
  4. 4.99² =
  5. 5.85² =
  6. 6.79² =
  7. 7.51² =
  8. 8.38² =
  9. 9.84² =
  10. 10.61² =
  11. 11.32² =
  12. 12.82² =
  13. 13.41² =
  14. 14.66² =
  15. 15.87² =
  16. 16.96² =
  17. 17.67² =
  18. 18.92² =
  19. 19.97² =
  20. 20.91² =
  21. 21.74² =
  22. 22.63² =
  23. 23.55² =
  24. 24.72² =
  25. 25.47² =
  26. 26.58² =
  27. 27.48² =
  28. 28.77² =
  29. 29.94² =
  30. 30.52² =
  31. 31.78² =
  32. 32.98² =
  33. 33.37² =
  34. 34.73² =
  35. 35.89² =
  36. 36.69² =
  37. 37.46² =
  38. 38.65² =
  39. 39.56² =
  40. 40.75² =

Answer key

  1. 3249
  2. 1936
  3. 1089
  4. 9801
  5. 7225
  6. 6241
  7. 2601
  8. 1444
  9. 7056
  10. 3721
  11. 1024
  12. 6724
  13. 1681
  14. 4356
  15. 7569
  16. 9216
  17. 4489
  18. 8464
  19. 9409
  20. 8281
  21. 5476
  22. 3969
  23. 3025
  24. 5184
  25. 2209
  26. 3364
  27. 2304
  28. 5929
  29. 8836
  30. 2704
  31. 6084
  32. 9604
  33. 1369
  34. 5329
  35. 7921
  36. 4761
  37. 2116
  38. 4225
  39. 3136
  40. 5625

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