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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 770 · 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. 1.39² =
  2. 2.61² =
  3. 3.19² =
  4. 4.69² =
  5. 5.29² =
  6. 6.61² =
  7. 7.31² =
  8. 8.39² =
  9. 9.31² =
  10. 10.39² =
  11. 11.31² =
  12. 12.41² =
  13. 13.71² =
  14. 14.89² =
  15. 15.49² =
  16. 16.39² =
  17. 17.39² =
  18. 18.91² =
  19. 19.79² =
  20. 20.91² =
  21. 21.41² =
  22. 22.31² =
  23. 23.29² =
  24. 24.31² =
  25. 25.59² =
  26. 26.49² =
  27. 27.91² =
  28. 28.79² =
  29. 29.89² =
  30. 30.81² =
  31. 31.29² =
  32. 32.31² =
  33. 33.51² =
  34. 34.91² =
  35. 35.89² =
  36. 36.39² =
  37. 37.61² =
  38. 38.59² =
  39. 39.89² =
  40. 40.59² =

Answer key

  1. 1521
  2. 3721
  3. 361
  4. 4761
  5. 841
  6. 3721
  7. 961
  8. 1521
  9. 961
  10. 1521
  11. 961
  12. 1681
  13. 5041
  14. 7921
  15. 2401
  16. 1521
  17. 1521
  18. 8281
  19. 6241
  20. 8281
  21. 1681
  22. 961
  23. 841
  24. 961
  25. 3481
  26. 2401
  27. 8281
  28. 6241
  29. 7921
  30. 6561
  31. 841
  32. 961
  33. 2601
  34. 8281
  35. 7921
  36. 1521
  37. 3721
  38. 3481
  39. 7921
  40. 3481

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