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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 394 · 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. 3.59² =
  4. 4.31² =
  5. 5.61² =
  6. 6.89² =
  7. 7.39² =
  8. 8.31² =
  9. 9.89² =
  10. 10.79² =
  11. 11.29² =
  12. 12.51² =
  13. 13.69² =
  14. 14.29² =
  15. 15.69² =
  16. 16.71² =
  17. 17.49² =
  18. 18.89² =
  19. 19.51² =
  20. 20.91² =
  21. 21.31² =
  22. 22.31² =
  23. 23.59² =
  24. 24.89² =
  25. 25.71² =
  26. 26.91² =
  27. 27.69² =
  28. 28.89² =
  29. 29.89² =
  30. 30.79² =
  31. 31.21² =
  32. 32.69² =
  33. 33.21² =
  34. 34.19² =
  35. 35.71² =
  36. 36.21² =
  37. 37.71² =
  38. 38.71² =
  39. 39.41² =
  40. 40.19² =

Answer key

  1. 361
  2. 1681
  3. 3481
  4. 961
  5. 3721
  6. 7921
  7. 1521
  8. 961
  9. 7921
  10. 6241
  11. 841
  12. 2601
  13. 4761
  14. 841
  15. 4761
  16. 5041
  17. 2401
  18. 7921
  19. 2601
  20. 8281
  21. 961
  22. 961
  23. 3481
  24. 7921
  25. 5041
  26. 8281
  27. 4761
  28. 7921
  29. 7921
  30. 6241
  31. 441
  32. 4761
  33. 441
  34. 361
  35. 5041
  36. 441
  37. 5041
  38. 5041
  39. 1681
  40. 361

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