← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 811 · 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. 1.61² =
  2. 2.41² =
  3. 3.59² =
  4. 4.61² =
  5. 5.21² =
  6. 6.71² =
  7. 7.51² =
  8. 8.59² =
  9. 9.59² =
  10. 10.41² =
  11. 11.19² =
  12. 12.91² =
  13. 13.21² =
  14. 14.79² =
  15. 15.29² =
  16. 16.91² =
  17. 17.61² =
  18. 18.29² =
  19. 19.19² =
  20. 20.29² =
  21. 21.19² =
  22. 22.49² =
  23. 23.69² =
  24. 24.69² =
  25. 25.81² =
  26. 26.91² =
  27. 27.91² =
  28. 28.39² =
  29. 29.51² =
  30. 30.29² =
  31. 31.91² =
  32. 32.91² =
  33. 33.49² =
  34. 34.41² =
  35. 35.49² =
  36. 36.31² =
  37. 37.91² =
  38. 38.61² =
  39. 39.89² =
  40. 40.21² =

Answer key

  1. 3721
  2. 1681
  3. 3481
  4. 3721
  5. 441
  6. 5041
  7. 2601
  8. 3481
  9. 3481
  10. 1681
  11. 361
  12. 8281
  13. 441
  14. 6241
  15. 841
  16. 8281
  17. 3721
  18. 841
  19. 361
  20. 841
  21. 361
  22. 2401
  23. 4761
  24. 4761
  25. 6561
  26. 8281
  27. 8281
  28. 1521
  29. 2601
  30. 841
  31. 8281
  32. 8281
  33. 2401
  34. 1681
  35. 2401
  36. 961
  37. 8281
  38. 3721
  39. 7921
  40. 441

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths