Judge and justify equations

4th Grade Math practice: Is 3 × 18 equal to 3 × 10 + 3 × 8. Part of stretch: number reasoning (Stretch: Number Reasoning).

~9 min

Students determine whether equations are true and justify with properties or calculation.

The Meaning of Equivalence

Group A
10
+
Group B
10
=
Total25
↕ swap order
Group B
10
+
Group A
10
=
Total25

An equation is a mathematical statement showing that two amounts are equal. For an equation to be true, both sides must result in the same total value.

💡 Check the value on the left side, then check the value on the right side. If they match, the equation is true.