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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 330 · 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. 2.79² =
  3. 3.29² =
  4. 4.71² =
  5. 5.39² =
  6. 6.79² =
  7. 7.31² =
  8. 8.79² =
  9. 9.69² =
  10. 10.61² =
  11. 11.71² =
  12. 12.39² =
  13. 13.89² =
  14. 14.89² =
  15. 15.69² =
  16. 16.31² =
  17. 17.31² =
  18. 18.39² =
  19. 19.41² =
  20. 20.29² =
  21. 21.71² =
  22. 22.59² =
  23. 23.19² =
  24. 24.51² =
  25. 25.61² =
  26. 26.61² =
  27. 27.61² =
  28. 28.61² =
  29. 29.51² =
  30. 30.61² =
  31. 31.19² =
  32. 32.69² =
  33. 33.89² =
  34. 34.31² =
  35. 35.19² =
  36. 36.49² =
  37. 37.59² =
  38. 38.69² =
  39. 39.21² =
  40. 40.51² =

Answer key

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

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