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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 251 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.31² =
  2. 2.41² =
  3. 3.39² =
  4. 4.89² =
  5. 5.61² =
  6. 6.69² =
  7. 7.19² =
  8. 8.59² =
  9. 9.61² =
  10. 10.59² =
  11. 11.49² =
  12. 12.49² =
  13. 13.19² =
  14. 14.59² =
  15. 15.21² =
  16. 16.59² =
  17. 17.59² =
  18. 18.69² =
  19. 19.21² =
  20. 20.71² =
  21. 21.89² =
  22. 22.61² =
  23. 23.49² =
  24. 24.89² =
  25. 25.19² =
  26. 26.21² =
  27. 27.19² =
  28. 28.81² =
  29. 29.81² =
  30. 30.51² =
  31. 31.81² =
  32. 32.51² =
  33. 33.91² =
  34. 34.39² =
  35. 35.61² =
  36. 36.91² =
  37. 37.69² =
  38. 38.89² =
  39. 39.19² =
  40. 40.61² =

Answer key

  1. 961
  2. 1681
  3. 1521
  4. 7921
  5. 3721
  6. 4761
  7. 361
  8. 3481
  9. 3721
  10. 3481
  11. 2401
  12. 2401
  13. 361
  14. 3481
  15. 441
  16. 3481
  17. 3481
  18. 4761
  19. 441
  20. 5041
  21. 7921
  22. 3721
  23. 2401
  24. 7921
  25. 361
  26. 441
  27. 361
  28. 6561
  29. 6561
  30. 2601
  31. 6561
  32. 2601
  33. 8281
  34. 1521
  35. 3721
  36. 8281
  37. 4761
  38. 7921
  39. 361
  40. 3721

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