Belonging, Euler–Venn diagrams, subsets, intersection
Answers are for parents and teachers.
1
M is the set of two-digit numbers divisible by 10. Put the signs: 70 … M, 25 … M, 100 … M.
∈, ∉, ∉
2
B = {3, 6, 9, 12}. Where do you write the numbers 9 and 10 in an Euler–Venn diagram?
9 inside the oval (9 ∈ B), 10 outside the oval (10 ∉ B).
3
A = {1, 2, 3, 4, 5, 6}, B = {2, 4, 6, 8}. Write A ∩ B.
{2, 4, 6}
4
Of the set of birds and the set of animals, which is the subset? Write it with the sign.
Birds ⊂ animals
5
Write the one-element subsets of A = {x, y, z}. How many are there?
3: {x}, {y}, {z}