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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 676 · 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. 2.41² =
  3. 3.51² =
  4. 4.91² =
  5. 5.39² =
  6. 6.19² =
  7. 7.31² =
  8. 8.69² =
  9. 9.31² =
  10. 10.89² =
  11. 11.69² =
  12. 12.19² =
  13. 13.59² =
  14. 14.81² =
  15. 15.49² =
  16. 16.79² =
  17. 17.89² =
  18. 18.51² =
  19. 19.81² =
  20. 20.69² =
  21. 21.51² =
  22. 22.49² =
  23. 23.79² =
  24. 24.79² =
  25. 25.91² =
  26. 26.59² =
  27. 27.19² =
  28. 28.69² =
  29. 29.21² =
  30. 30.19² =
  31. 31.39² =
  32. 32.59² =
  33. 33.91² =
  34. 34.61² =
  35. 35.89² =
  36. 36.51² =
  37. 37.41² =
  38. 38.49² =
  39. 39.81² =
  40. 40.71² =

Answer key

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

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