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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 342 · 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. 1.21² =
  2. 2.61² =
  3. 3.61² =
  4. 4.51² =
  5. 5.61² =
  6. 6.29² =
  7. 7.39² =
  8. 8.71² =
  9. 9.81² =
  10. 10.71² =
  11. 11.59² =
  12. 12.21² =
  13. 13.61² =
  14. 14.61² =
  15. 15.61² =
  16. 16.31² =
  17. 17.19² =
  18. 18.71² =
  19. 19.39² =
  20. 20.69² =
  21. 21.71² =
  22. 22.31² =
  23. 23.39² =
  24. 24.39² =
  25. 25.89² =
  26. 26.69² =
  27. 27.89² =
  28. 28.19² =
  29. 29.39² =
  30. 30.81² =
  31. 31.61² =
  32. 32.51² =
  33. 33.71² =
  34. 34.81² =
  35. 35.49² =
  36. 36.91² =
  37. 37.91² =
  38. 38.51² =
  39. 39.69² =
  40. 40.89² =

Answer key

  1. 441
  2. 3721
  3. 3721
  4. 2601
  5. 3721
  6. 841
  7. 1521
  8. 5041
  9. 6561
  10. 5041
  11. 3481
  12. 441
  13. 3721
  14. 3721
  15. 3721
  16. 961
  17. 361
  18. 5041
  19. 1521
  20. 4761
  21. 5041
  22. 961
  23. 1521
  24. 1521
  25. 7921
  26. 4761
  27. 7921
  28. 361
  29. 1521
  30. 6561
  31. 3721
  32. 2601
  33. 5041
  34. 6561
  35. 2401
  36. 8281
  37. 8281
  38. 2601
  39. 4761
  40. 7921

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