← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 544 · 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. 1.79² =
  2. 2.59² =
  3. 3.69² =
  4. 4.39² =
  5. 5.71² =
  6. 6.89² =
  7. 7.49² =
  8. 8.19² =
  9. 9.81² =
  10. 10.39² =
  11. 11.59² =
  12. 12.31² =
  13. 13.81² =
  14. 14.21² =
  15. 15.31² =
  16. 16.21² =
  17. 17.59² =
  18. 18.71² =
  19. 19.81² =
  20. 20.91² =
  21. 21.91² =
  22. 22.49² =
  23. 23.51² =
  24. 24.31² =
  25. 25.21² =
  26. 26.89² =
  27. 27.39² =
  28. 28.41² =
  29. 29.21² =
  30. 30.81² =
  31. 31.19² =
  32. 32.29² =
  33. 33.79² =
  34. 34.91² =
  35. 35.89² =
  36. 36.79² =
  37. 37.49² =
  38. 38.79² =
  39. 39.71² =
  40. 40.89² =

Answer key

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

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