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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 536 · 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. 1.21² =
  2. 2.31² =
  3. 3.19² =
  4. 4.91² =
  5. 5.41² =
  6. 6.79² =
  7. 7.79² =
  8. 8.39² =
  9. 9.79² =
  10. 10.21² =
  11. 11.19² =
  12. 12.41² =
  13. 13.81² =
  14. 14.91² =
  15. 15.91² =
  16. 16.39² =
  17. 17.51² =
  18. 18.31² =
  19. 19.79² =
  20. 20.69² =
  21. 21.39² =
  22. 22.51² =
  23. 23.81² =
  24. 24.79² =
  25. 25.49² =
  26. 26.31² =
  27. 27.49² =
  28. 28.71² =
  29. 29.91² =
  30. 30.59² =
  31. 31.79² =
  32. 32.59² =
  33. 33.71² =
  34. 34.71² =
  35. 35.61² =
  36. 36.31² =
  37. 37.51² =
  38. 38.89² =
  39. 39.59² =
  40. 40.51² =

Answer key

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

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