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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 192 · 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. 2.89² =
  3. 3.51² =
  4. 4.21² =
  5. 5.51² =
  6. 6.39² =
  7. 7.51² =
  8. 8.61² =
  9. 9.31² =
  10. 10.21² =
  11. 11.29² =
  12. 12.61² =
  13. 13.71² =
  14. 14.41² =
  15. 15.31² =
  16. 16.39² =
  17. 17.51² =
  18. 18.31² =
  19. 19.39² =
  20. 20.49² =
  21. 21.69² =
  22. 22.19² =
  23. 23.31² =
  24. 24.41² =
  25. 25.39² =
  26. 26.71² =
  27. 27.89² =
  28. 28.69² =
  29. 29.29² =
  30. 30.21² =
  31. 31.29² =
  32. 32.79² =
  33. 33.71² =
  34. 34.39² =
  35. 35.31² =
  36. 36.19² =
  37. 37.51² =
  38. 38.21² =
  39. 39.31² =
  40. 40.79² =

Answer key

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

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