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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 694 · 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. 1.79² =
  2. 2.69² =
  3. 3.81² =
  4. 4.19² =
  5. 5.39² =
  6. 6.89² =
  7. 7.79² =
  8. 8.61² =
  9. 9.29² =
  10. 10.51² =
  11. 11.39² =
  12. 12.49² =
  13. 13.19² =
  14. 14.59² =
  15. 15.49² =
  16. 16.49² =
  17. 17.91² =
  18. 18.49² =
  19. 19.29² =
  20. 20.51² =
  21. 21.51² =
  22. 22.59² =
  23. 23.59² =
  24. 24.79² =
  25. 25.41² =
  26. 26.89² =
  27. 27.79² =
  28. 28.41² =
  29. 29.61² =
  30. 30.51² =
  31. 31.51² =
  32. 32.91² =
  33. 33.59² =
  34. 34.91² =
  35. 35.71² =
  36. 36.39² =
  37. 37.19² =
  38. 38.59² =
  39. 39.21² =
  40. 40.59² =

Answer key

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

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