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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 28 · 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. 1.41² =
  2. 2.21² =
  3. 3.21² =
  4. 4.39² =
  5. 5.71² =
  6. 6.91² =
  7. 7.21² =
  8. 8.29² =
  9. 9.79² =
  10. 10.59² =
  11. 11.21² =
  12. 12.41² =
  13. 13.29² =
  14. 14.59² =
  15. 15.71² =
  16. 16.19² =
  17. 17.61² =
  18. 18.69² =
  19. 19.51² =
  20. 20.89² =
  21. 21.61² =
  22. 22.41² =
  23. 23.21² =
  24. 24.51² =
  25. 25.71² =
  26. 26.49² =
  27. 27.71² =
  28. 28.19² =
  29. 29.59² =
  30. 30.91² =
  31. 31.61² =
  32. 32.79² =
  33. 33.81² =
  34. 34.49² =
  35. 35.79² =
  36. 36.91² =
  37. 37.29² =
  38. 38.39² =
  39. 39.59² =
  40. 40.21² =

Answer key

  1. 1681
  2. 441
  3. 441
  4. 1521
  5. 5041
  6. 8281
  7. 441
  8. 841
  9. 6241
  10. 3481
  11. 441
  12. 1681
  13. 841
  14. 3481
  15. 5041
  16. 361
  17. 3721
  18. 4761
  19. 2601
  20. 7921
  21. 3721
  22. 1681
  23. 441
  24. 2601
  25. 5041
  26. 2401
  27. 5041
  28. 361
  29. 3481
  30. 8281
  31. 3721
  32. 6241
  33. 6561
  34. 2401
  35. 6241
  36. 8281
  37. 841
  38. 1521
  39. 3481
  40. 441

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