Task Sets: Subsets: Proper, Improper, and the Subsets Formula - Uganda NCDC Primary 7 Mathematics

Recall / Warm-Up

These problems review set notation and membership from earlier work.

Which statement correctly uses membership notation for the set $B = \{2, 4, 6, 8\}$ ?

$4 \in B$

$4 \notin B$

$5 \in B$

$\{4\} \in B$

Is the set $F = \{\text{days of the week}\}$ a finite set or an infinite set?

Finite — it has exactly 7 elements, which you can count.

Infinite — the days keep repeating week after week.

Neither — a set of days cannot be measured.

Fluency Practice

Given $A = \{1, 2\}$ and $B = \{1, 2, 3, 4\}$ , which statement is true?

$A \subseteq B$

$A \in B$

$B \subseteq A$

$A \notsubseteq B$

For the set $B = \{5, 6, 7\}$ , which subset is the improper subset of $B$ ?

$\{5, 6, 7\}$

$\{5, 6\}$

$\varnothing$

$\{5\}$

$Oval A inside oval B; oval C with element 5 sitting outside oval B$

Look at the diagram. Set $A = \{1, 2\}$ is drawn inside set $B = \{1, 2, 3, 4\}$ , while $C = \{1, 5\}$ has one element outside $B$ . How many elements of $C$ lie OUTSIDE $B$ ?

A set has $3$ elements. Using the subsets formula, how many subsets does it have in total?

How many subsets does the set $\{a, b, c, d\}$ have?

A set has $32$ subsets in total. How many elements does the set have?

Exercises: Subsets: Proper, Improper, and the Subsets Formula

Recall / Warm-Up

Fluency Practice