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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 534 · 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. 1.19² =
  2. 2.51² =
  3. 3.41² =
  4. 4.81² =
  5. 5.89² =
  6. 6.59² =
  7. 7.49² =
  8. 8.89² =
  9. 9.71² =
  10. 10.51² =
  11. 11.91² =
  12. 12.69² =
  13. 13.19² =
  14. 14.89² =
  15. 15.59² =
  16. 16.71² =
  17. 17.39² =
  18. 18.39² =
  19. 19.71² =
  20. 20.49² =
  21. 21.39² =
  22. 22.29² =
  23. 23.21² =
  24. 24.91² =
  25. 25.71² =
  26. 26.41² =
  27. 27.29² =
  28. 28.21² =
  29. 29.39² =
  30. 30.69² =
  31. 31.51² =
  32. 32.21² =
  33. 33.89² =
  34. 34.79² =
  35. 35.91² =
  36. 36.69² =
  37. 37.21² =
  38. 38.71² =
  39. 39.29² =
  40. 40.69² =

Answer key

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

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