In mathematics, we talk about number sentences (called equations) that are equivalent. "Equivalent" means that one side of the number sentence is equal to the other side.
Since mathematics is a special language, we can show that one side of the equal is equal to the other using the equals sign, =.
For example, I could write $1+2=3$1+2=3. Since both sides of the equation are equal to $3$3, we can say that this is an equivalent number sentence. Watch this video now as we look at some more ways we can write equivalent number sentences.
Worked Examples
Question 1
Complete the number sentence: $27+\editable{}=52$27+=52.
Think: If we start at $27$27, how many do we need to count up by to reach $52$52. We can use a strategy (e.g. the jump strategy) to help us work this out.
Do: $27+25=52$27+25=52. The missing number is $25$25.
Question 2
Complete the number sentence:
$119-\editable{}=46+47$119−=46+47