What Is the Sum?

Learn to add up four one-digit numbers.

Grocery Shopping

It's time to do a little grocery shopping. There are 8 items on the list. You will to need to make sure you brought enough money with you. You have two $20 bills, or $40. Will it be enough?

The first four items on the list are for tonight's salad.

grocery shopping list: lettuce, carrot bag, 2 cucumbers, pack of tomatoes

They were all easy to find. The first four items are in the produce section. Now, make note of how much each item cost, and see how you're doing with the money you brought.


$1	$2	$1	$4


$1	$2	$1	$4

Add these four numbers up to see how much the produce will cost.

$1
$2
$1
+$4

To start, add the first two numbers together. What is 1 + 2?

$1	>	$3
$2	>	$3
$1
+$4

Now, add the next two numbers together. What is 1 + 4?

$1	>	$3
$2
$1	>	$5
+$4

It's time to add your two smaller answers together. What is 3 + 5? Check your answer.

$1	>	$3
$2
$1	>	$5
+$4

Great adding! The produce items on your list will cost $8. Now, look at the last four items on the list.

grocery shopping list: salad dressing, rotisserie chicken, rolls, pie

Put all of the items in your cart, and see how much they cost as you go.


$4	$9	$6	$8

Get these four numbers ready to add, to see what they cost.

$4
$9
$6
+$8

Wow, these numbers are a lot bigger. Do you know how you should add these? Click the arrow to turn the page and peek into a classroom window. Listen to the teacher and student discussing a good strategy.