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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 639 · 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. 1.91² =
  2. 2.51² =
  3. 3.81² =
  4. 4.51² =
  5. 5.61² =
  6. 6.21² =
  7. 7.49² =
  8. 8.49² =
  9. 9.29² =
  10. 10.89² =
  11. 11.51² =
  12. 12.29² =
  13. 13.61² =
  14. 14.61² =
  15. 15.39² =
  16. 16.49² =
  17. 17.69² =
  18. 18.89² =
  19. 19.29² =
  20. 20.71² =
  21. 21.79² =
  22. 22.21² =
  23. 23.69² =
  24. 24.29² =
  25. 25.69² =
  26. 26.21² =
  27. 27.41² =
  28. 28.69² =
  29. 29.39² =
  30. 30.29² =
  31. 31.59² =
  32. 32.59² =
  33. 33.49² =
  34. 34.69² =
  35. 35.81² =
  36. 36.71² =
  37. 37.41² =
  38. 38.29² =
  39. 39.69² =
  40. 40.81² =

Answer key

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

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