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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 390 · 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. 1.31² =
  2. 2.89² =
  3. 3.21² =
  4. 4.21² =
  5. 5.51² =
  6. 6.71² =
  7. 7.91² =
  8. 8.39² =
  9. 9.91² =
  10. 10.39² =
  11. 11.79² =
  12. 12.61² =
  13. 13.59² =
  14. 14.81² =
  15. 15.79² =
  16. 16.29² =
  17. 17.19² =
  18. 18.89² =
  19. 19.49² =
  20. 20.49² =
  21. 21.91² =
  22. 22.41² =
  23. 23.69² =
  24. 24.31² =
  25. 25.31² =
  26. 26.29² =
  27. 27.91² =
  28. 28.31² =
  29. 29.21² =
  30. 30.59² =
  31. 31.21² =
  32. 32.51² =
  33. 33.19² =
  34. 34.61² =
  35. 35.51² =
  36. 36.51² =
  37. 37.49² =
  38. 38.89² =
  39. 39.21² =
  40. 40.21² =

Answer key

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

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