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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 615 · 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. 1.73² =
  2. 2.68² =
  3. 3.33² =
  4. 4.97² =
  5. 5.32² =
  6. 6.71² =
  7. 7.51² =
  8. 8.98² =
  9. 9.91² =
  10. 10.82² =
  11. 11.74² =
  12. 12.95² =
  13. 13.62² =
  14. 14.78² =
  15. 15.69² =
  16. 16.39² =
  17. 17.76² =
  18. 18.66² =
  19. 19.37² =
  20. 20.99² =
  21. 21.83² =
  22. 22.88² =
  23. 23.72² =
  24. 24.34² =
  25. 25.43² =
  26. 26.54² =
  27. 27.81² =
  28. 28.94² =
  29. 29.49² =
  30. 30.77² =
  31. 31.61² =
  32. 32.38² =
  33. 33.47² =
  34. 34.84² =
  35. 35.45² =
  36. 36.41² =
  37. 37.52² =
  38. 38.44² =
  39. 39.89² =
  40. 40.48² =

Answer key

  1. 5329
  2. 4624
  3. 1089
  4. 9409
  5. 1024
  6. 5041
  7. 2601
  8. 9604
  9. 8281
  10. 6724
  11. 5476
  12. 9025
  13. 3844
  14. 6084
  15. 4761
  16. 1521
  17. 5776
  18. 4356
  19. 1369
  20. 9801
  21. 6889
  22. 7744
  23. 5184
  24. 1156
  25. 1849
  26. 2916
  27. 6561
  28. 8836
  29. 2401
  30. 5929
  31. 3721
  32. 1444
  33. 2209
  34. 7056
  35. 2025
  36. 1681
  37. 2704
  38. 1936
  39. 7921
  40. 2304

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