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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 277 · 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. 1.71² =
  2. 2.19² =
  3. 3.61² =
  4. 4.49² =
  5. 5.59² =
  6. 6.91² =
  7. 7.59² =
  8. 8.39² =
  9. 9.91² =
  10. 10.59² =
  11. 11.91² =
  12. 12.89² =
  13. 13.51² =
  14. 14.71² =
  15. 15.19² =
  16. 16.41² =
  17. 17.41² =
  18. 18.79² =
  19. 19.41² =
  20. 20.31² =
  21. 21.31² =
  22. 22.49² =
  23. 23.19² =
  24. 24.79² =
  25. 25.49² =
  26. 26.69² =
  27. 27.59² =
  28. 28.29² =
  29. 29.69² =
  30. 30.71² =
  31. 31.71² =
  32. 32.59² =
  33. 33.71² =
  34. 34.71² =
  35. 35.79² =
  36. 36.71² =
  37. 37.91² =
  38. 38.51² =
  39. 39.49² =
  40. 40.89² =

Answer key

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

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