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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 358 · 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. 1.39² =
  2. 2.79² =
  3. 3.91² =
  4. 4.51² =
  5. 5.59² =
  6. 6.81² =
  7. 7.69² =
  8. 8.31² =
  9. 9.41² =
  10. 10.59² =
  11. 11.29² =
  12. 12.89² =
  13. 13.79² =
  14. 14.59² =
  15. 15.79² =
  16. 16.29² =
  17. 17.49² =
  18. 18.41² =
  19. 19.59² =
  20. 20.71² =
  21. 21.59² =
  22. 22.49² =
  23. 23.79² =
  24. 24.49² =
  25. 25.21² =
  26. 26.91² =
  27. 27.61² =
  28. 28.21² =
  29. 29.41² =
  30. 30.39² =
  31. 31.41² =
  32. 32.49² =
  33. 33.59² =
  34. 34.49² =
  35. 35.51² =
  36. 36.69² =
  37. 37.29² =
  38. 38.61² =
  39. 39.91² =
  40. 40.51² =

Answer key

  1. 1521
  2. 6241
  3. 8281
  4. 2601
  5. 3481
  6. 6561
  7. 4761
  8. 961
  9. 1681
  10. 3481
  11. 841
  12. 7921
  13. 6241
  14. 3481
  15. 6241
  16. 841
  17. 2401
  18. 1681
  19. 3481
  20. 5041
  21. 3481
  22. 2401
  23. 6241
  24. 2401
  25. 441
  26. 8281
  27. 3721
  28. 441
  29. 1681
  30. 1521
  31. 1681
  32. 2401
  33. 3481
  34. 2401
  35. 2601
  36. 4761
  37. 841
  38. 3721
  39. 8281
  40. 2601

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