Addition Within 10: practice solutions, Kindergarten – download the PDF

1 Count and add ★★★

There are 2 orange counters and 3 blue counters. Put them together and count: 1, 2, 3, 4, 5.

\(2 + 3 = 5\)

There are 5 counters in all.

2 Fingers ★★★

We put the fingers together: \(4 + 1 = 5\).

Sam shows 5 fingers.

3 Doubles ★★★

1. \(1 + 1 = 2\)
2. \(2 + 2 = 4\)
3. \(3 + 3 = 6\)

Adding the same number twice is called a double.

4 Birds on a branch ★★★

This is an adding-to story. We start with 4 and 2 more come.

\(4 + 2 = 6\)

There are 6 birds on the fence.

5 Hop on the number line ★★★

From 3, hop: 4, 5, 6. You land on 6.

\(3 + 3 = 6\)

6 Ten frame story ★★★

The first row has 5 orange counters. The second row has 2 blue counters.

\(5 + 2 = 7\)

The sum is 7.

7 Adding zero ★★★

1. \(6 + 0 = 6\)
2. \(0 + 4 = 4\)

When you add 0, the number does not change, because you add nothing.

8 How many empty spaces? ★★★

There are 6 orange counters and 3 blue counters: \(6 + 3 = 9\).

The frame has 10 spaces and 9 are full. So 1 space is empty.

9 True or false? ★★★

1. True. Hopping 4 from 3 lands on 7.
2. False. \(5 + 2 = 7\), not 8.
3. True. Adding 1 gives the next number after 6, which is 7.

10 Switch the order ★★★

\(2 + 6 = 8\) and \(6 + 2 = 8\).

The sums are the same. The order of the addends does not change the sum.

11 Cookies on a plate ★★★

We start with 5 and add 4 more: \(5 + 4 = 9\).

There are 9 cookies on the plate.

12 Draw the story ★★★

Draw 3 circles, then 4 more circles, and count them all.

\(3 + 4 = 7\). Maya has 7 stickers.

13 Ways to make 7 ★★★

Here are all the pairs, starting from 0: \(0 + 7\), \(1 + 6\), \(2 + 5\), \(3 + 4\). Switching the order gives more pairs, such as \(6 + 1\).

Any three of these are correct, and each one has the sum 7.

14 Which sum is bigger? ★★★

\(4 + 3 = 7\) and \(2 + 4 = 6\).

Since 7 is bigger than 6, \(4 + 3\) is bigger.

15 Make 10 ★★★

The frame has 4 empty spaces. Filling them with 4 blue counters makes 10.

\(6 + 4 = 10\). You need 4 blue counters.

16 Three teams ★★★

First add two numbers: \(2 + 3 = 5\). Then add the last team: \(5 + 4 = 9\).

\(2 + 3 + 4 = 9\). The teams score 9 points in all.

17 Act it out ★★★

Put 5 counters in a box that is the bus. Then put 3 more counters in the box. Count all the counters: 8.

\(5 + 3 = 8\). There are 8 children on the bus.

18 Find the mistake ★★★

Start at 4 on a number line and hop 5 times: 5, 6, 7, 8, 9. You land on 9.

\(4 + 5 = 9\). Leo is not right. He stopped one hop too early.

19 Match the story ★★★

The plus sign means joining, so we need a story where ducks come.

The answer is (a). In story (b) the ducks leave, so the group gets smaller.

20 Write your own story ★★★

Example: Noah has 3 toy trucks. He gets 6 more toy trucks for his birthday. How many trucks does he have?

\(3 + 6 = 9\). Noah has 9 trucks. (Many other stories are correct.)

21 Mystery numbers ★★★

Try pairs that make 9: \(1 + 8\), \(2 + 7\), \(3 + 6\), \(4 + 5\).

Only \(4 + 5\) has numbers that differ by 1. The numbers are 4 and 5.

22 Two hops ★★★

From 1, hop 2: you land on 3. Then hop 3 more: 4, 5, 6.

\(1 + 2 + 3 = 6\). You land on 6.