Idea 7of 23Builds onEstimate a total by rounding
Multiply each line, then add
How do you total a receipt when you buy several of one thing?
Today you'll discover
- how to price one line of a receipt
- why you add lines, not shelf prices
- how to check with an estimate
Think first4 pencils at $0.79 each
What do the 4 pencils cost?
Decide first, then press Next. Work one line of the receipt at a time.
A receipt: pencils, 4 × $0.79; erasers, 2 × $1.25; a ruler, $1.99; the cost column shows question marks, the first line outlined. Then the line costs appear, $3.16, $2.50 and $1.99, and the total $7.65, with an estimate of about $8 beside them. The last step shows 3 hats at $4.50 and 2 scarves at $6.25.
See the whole ideathe big idea and the key word, in one place
The big idea
Multiply each price by how many to get each line, then add the lines.
Line by line
How many × price = line cost. Add the line costs to get the total.
- 4 × $0.79$3.16
- 2 × $1.25$2.50
- 1 × $1.99$1.99
- Total$7.65
Easy to get wrongAdding the shelf prices, $0.79 + $1.25 + $1.99, prices one of each, not the 4 pencils and 2 erasers in the cart.
Key word
- line cost
- the price of one item times how many you buy: 4 × $0.79 = $3.16
Ready to use it?
- Price each line of a receipt.
- Add the lines to find the total.