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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 416 · 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. 3.21² =
  4. 4.79² =
  5. 5.41² =
  6. 6.41² =
  7. 7.79² =
  8. 8.29² =
  9. 9.31² =
  10. 10.59² =
  11. 11.81² =
  12. 12.81² =
  13. 13.39² =
  14. 14.29² =
  15. 15.29² =
  16. 16.61² =
  17. 17.81² =
  18. 18.21² =
  19. 19.31² =
  20. 20.69² =
  21. 21.49² =
  22. 22.61² =
  23. 23.29² =
  24. 24.89² =
  25. 25.21² =
  26. 26.69² =
  27. 27.51² =
  28. 28.49² =
  29. 29.31² =
  30. 30.49² =
  31. 31.69² =
  32. 32.79² =
  33. 33.39² =
  34. 34.59² =
  35. 35.59² =
  36. 36.81² =
  37. 37.71² =
  38. 38.69² =
  39. 39.81² =
  40. 40.89² =

Answer key

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

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