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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 708 · 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. 2.31² =
  3. 3.21² =
  4. 4.49² =
  5. 5.19² =
  6. 6.71² =
  7. 7.39² =
  8. 8.81² =
  9. 9.71² =
  10. 10.81² =
  11. 11.79² =
  12. 12.31² =
  13. 13.31² =
  14. 14.69² =
  15. 15.31² =
  16. 16.91² =
  17. 17.19² =
  18. 18.81² =
  19. 19.19² =
  20. 20.69² =
  21. 21.79² =
  22. 22.71² =
  23. 23.41² =
  24. 24.71² =
  25. 25.49² =
  26. 26.41² =
  27. 27.89² =
  28. 28.39² =
  29. 29.59² =
  30. 30.49² =
  31. 31.91² =
  32. 32.81² =
  33. 33.49² =
  34. 34.21² =
  35. 35.31² =
  36. 36.19² =
  37. 37.19² =
  38. 38.21² =
  39. 39.51² =
  40. 40.21² =

Answer key

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

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