← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 464 · 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. 1.59² =
  2. 2.69² =
  3. 3.79² =
  4. 4.21² =
  5. 5.91² =
  6. 6.39² =
  7. 7.61² =
  8. 8.59² =
  9. 9.59² =
  10. 10.51² =
  11. 11.41² =
  12. 12.49² =
  13. 13.29² =
  14. 14.39² =
  15. 15.39² =
  16. 16.89² =
  17. 17.41² =
  18. 18.71² =
  19. 19.29² =
  20. 20.29² =
  21. 21.21² =
  22. 22.51² =
  23. 23.59² =
  24. 24.19² =
  25. 25.29² =
  26. 26.29² =
  27. 27.51² =
  28. 28.79² =
  29. 29.51² =
  30. 30.79² =
  31. 31.31² =
  32. 32.91² =
  33. 33.81² =
  34. 34.59² =
  35. 35.69² =
  36. 36.19² =
  37. 37.19² =
  38. 38.69² =
  39. 39.49² =
  40. 40.29² =

Answer key

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

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