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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 329 · 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. 1.39² =
  2. 2.31² =
  3. 3.91² =
  4. 4.71² =
  5. 5.21² =
  6. 6.19² =
  7. 7.59² =
  8. 8.71² =
  9. 9.61² =
  10. 10.41² =
  11. 11.71² =
  12. 12.59² =
  13. 13.51² =
  14. 14.29² =
  15. 15.79² =
  16. 16.39² =
  17. 17.51² =
  18. 18.91² =
  19. 19.51² =
  20. 20.69² =
  21. 21.21² =
  22. 22.81² =
  23. 23.91² =
  24. 24.41² =
  25. 25.49² =
  26. 26.79² =
  27. 27.41² =
  28. 28.71² =
  29. 29.21² =
  30. 30.19² =
  31. 31.59² =
  32. 32.89² =
  33. 33.71² =
  34. 34.49² =
  35. 35.89² =
  36. 36.21² =
  37. 37.49² =
  38. 38.59² =
  39. 39.79² =
  40. 40.81² =

Answer key

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

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