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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 445 · 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. 1.61² =
  2. 2.81² =
  3. 3.21² =
  4. 4.61² =
  5. 5.69² =
  6. 6.19² =
  7. 7.91² =
  8. 8.79² =
  9. 9.29² =
  10. 10.49² =
  11. 11.19² =
  12. 12.19² =
  13. 13.21² =
  14. 14.29² =
  15. 15.39² =
  16. 16.71² =
  17. 17.61² =
  18. 18.41² =
  19. 19.39² =
  20. 20.71² =
  21. 21.61² =
  22. 22.81² =
  23. 23.69² =
  24. 24.49² =
  25. 25.71² =
  26. 26.31² =
  27. 27.59² =
  28. 28.89² =
  29. 29.51² =
  30. 30.59² =
  31. 31.29² =
  32. 32.39² =
  33. 33.39² =
  34. 34.29² =
  35. 35.49² =
  36. 36.29² =
  37. 37.39² =
  38. 38.89² =
  39. 39.51² =
  40. 40.51² =

Answer key

  1. 3721
  2. 6561
  3. 441
  4. 3721
  5. 4761
  6. 361
  7. 8281
  8. 6241
  9. 841
  10. 2401
  11. 361
  12. 361
  13. 441
  14. 841
  15. 1521
  16. 5041
  17. 3721
  18. 1681
  19. 1521
  20. 5041
  21. 3721
  22. 6561
  23. 4761
  24. 2401
  25. 5041
  26. 961
  27. 3481
  28. 7921
  29. 2601
  30. 3481
  31. 841
  32. 1521
  33. 1521
  34. 841
  35. 2401
  36. 841
  37. 1521
  38. 7921
  39. 2601
  40. 2601

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