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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 123 · 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. 1.51² =
  2. 2.91² =
  3. 3.41² =
  4. 4.41² =
  5. 5.61² =
  6. 6.41² =
  7. 7.39² =
  8. 8.39² =
  9. 9.71² =
  10. 10.29² =
  11. 11.61² =
  12. 12.69² =
  13. 13.19² =
  14. 14.61² =
  15. 15.51² =
  16. 16.51² =
  17. 17.91² =
  18. 18.79² =
  19. 19.29² =
  20. 20.89² =
  21. 21.81² =
  22. 22.51² =
  23. 23.31² =
  24. 24.81² =
  25. 25.41² =
  26. 26.81² =
  27. 27.19² =
  28. 28.21² =
  29. 29.91² =
  30. 30.39² =
  31. 31.29² =
  32. 32.61² =
  33. 33.91² =
  34. 34.49² =
  35. 35.61² =
  36. 36.89² =
  37. 37.81² =
  38. 38.49² =
  39. 39.29² =
  40. 40.21² =

Answer key

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

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