SME
Grade 4 Math · Problem type
Solve problems involving money
Use this for “A book costs $3.45 and a pen $1.80. How much in all?” For what is left, give the total and one price.
Diagram
$3.45 + $1.80 = $5.25
This is an example. Type your own values to start a new problem.
$
First amount
+
$
Second amount
=
$
Total
Formulas
3.45 + 1.8 = 5.25
First amount + second amount = total
Assumptions
•
Money is a decimal: dollars before the point, cents after. $3.45 is 3 dollars and 45 cents.
•
Line up the points and add or subtract like whole numbers. Each amount to $999.99.
•
To find what is left, take the price from the total: total − price = left.
Step-by-step
WE KNOW
First amount: $3.45
Second amount: $1.80
FIND
total
Step 1 · Find total
3.45 + 1.8 = ?
First amount + second amount = total
Line up the points. Add the cents, then the dollars, regrouping 100 cents as a dollar.
1
3
.
4
5
+
1
.
8
0
5
.
2
5
Total = $5.25
Check
Put the numbers back in. Both sides should match.
3.45 + 1.8 = 5.25 ✓
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