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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 424 · 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. 2.19² =
  3. 3.69² =
  4. 4.89² =
  5. 5.29² =
  6. 6.31² =
  7. 7.31² =
  8. 8.19² =
  9. 9.81² =
  10. 10.51² =
  11. 11.41² =
  12. 12.21² =
  13. 13.59² =
  14. 14.61² =
  15. 15.49² =
  16. 16.71² =
  17. 17.81² =
  18. 18.61² =
  19. 19.71² =
  20. 20.49² =
  21. 21.61² =
  22. 22.49² =
  23. 23.69² =
  24. 24.61² =
  25. 25.81² =
  26. 26.31² =
  27. 27.89² =
  28. 28.39² =
  29. 29.61² =
  30. 30.69² =
  31. 31.81² =
  32. 32.49² =
  33. 33.49² =
  34. 34.61² =
  35. 35.51² =
  36. 36.79² =
  37. 37.59² =
  38. 38.19² =
  39. 39.21² =
  40. 40.51² =

Answer key

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

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