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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 822 · 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. 2.39² =
  3. 3.59² =
  4. 4.79² =
  5. 5.51² =
  6. 6.19² =
  7. 7.39² =
  8. 8.79² =
  9. 9.89² =
  10. 10.79² =
  11. 11.49² =
  12. 12.51² =
  13. 13.31² =
  14. 14.69² =
  15. 15.51² =
  16. 16.49² =
  17. 17.69² =
  18. 18.71² =
  19. 19.31² =
  20. 20.51² =
  21. 21.29² =
  22. 22.31² =
  23. 23.39² =
  24. 24.81² =
  25. 25.29² =
  26. 26.89² =
  27. 27.51² =
  28. 28.71² =
  29. 29.81² =
  30. 30.79² =
  31. 31.41² =
  32. 32.69² =
  33. 33.29² =
  34. 34.89² =
  35. 35.81² =
  36. 36.49² =
  37. 37.89² =
  38. 38.79² =
  39. 39.51² =
  40. 40.61² =

Answer key

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

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