Question

1. assessment practice match each number with the equation it is missing from.

$4 + 12 + 5 = 39 - \underline{\quad\quad}$
$\underline{\quad\quad} + 14 = 7 + 7 + 20$
$28 + 10 + 10 = \underline{\quad\quad} + 24$
$\underline{\quad\quad} + 16 = 26 + 10 + 10$
24
18
20
30

Explanation:

Step1: Solve first equation

Calculate left side: $4+12+5=21$. Let $x$ be the missing number: $21=39-x$, so $x=39-21=18$.

Step2: Solve second equation

Calculate right side: $7+7+20=34$. Let $x$ be the missing number: $x+14=34$, so $x=34-14=20$.

Step3: Solve third equation

Calculate left side: $28+10+10=48$. Let $x$ be the missing number: $48=x+24$, so $x=48-24=24$.

Step4: Solve fourth equation

Calculate right side: $26+10+10=46$. Let $x$ be the missing number: $x+16=46$, so $x=46-16=30$.

Answer:

$4 + 12 + 5 = 39 - \boldsymbol{18}$
$\boldsymbol{20} + 14 = 7 + 7 + 20$
$28 + 10 + 10 = \boldsymbol{24} + 24$
$\boldsymbol{30} + 16 = 26 + 10 + 10$