Three. Fill in the numbers adjacent to the following numbers.

____5____ ____ 13____ ____9____ ____ 1 1____ ___ 16____

Four, fill in the number of components and addition and subtraction.

7 6 9

/\ /\ /\

5 ( ) 4 ( ) 6 ( )

2 ( ) 2 ( ) 3 ( )

( )+( )=( ) ( )+( )=( ) ( )+( )=( ) ( )+( )=( ) ( )+( )=( ) ( )+( )=( )

( ) - ( )=( ) ( ) - ( )=( ) ( ) - ( )=( ) ( ) - ( )=( ) ( ) - ( )=( ) ( ) - ( )=( )

5. Add or subtract within10.

1+2= 9- 1= 9+2= 6+4= 12+3= 3+ 1= 8-3= 8+4= 12-7= 7+ 1= 15+ 1= 4+2=

6-2= 5+5= 10-5= 5+4= 13+2= 3+0= 3-3= 3+ 1= 8-3= 1+2= 9- 1= 9+2=

Sixth, the application problem.

1. There are six ducks in the river, and five others are swimming. How many ducks are there in the river?

2. Three chickens are playing games on the grass. After two chickens came, three chickens came later. How many chickens are playing games now?

3. Xiaohong has 10 notebooks, and used 5 notebooks for homework. How many notebooks does Xiaohong have left?

There are 12 birds in the tree, and five others fly in. Soon, four birds flew to the grass to feed. How many birds are there in the tree?