1. 先圈出10，再算一算。
(1)
9 + 4

10

(2)
9 + =

10

(1)
$9 + 4 = \boxed{13}$
$\quad\quad\boxed{1}\quad\boxed{3}$
$\diagdown\quad\diagup$
$\quad\quad\quad10$
(2)
$9 + \boxed{8} = \boxed{17}$
$\quad\quad\quad\boxed{1}\quad\boxed{7}$
$\diagdown\quad\quad\diagup$
$\quad\quad\quad\quad10$

2. 算一算。
9+6=
9+1+5=
9+2=
9+1+1=
9+9=
9+1+8=
9+5=
9+1+4=

9+6=15
9+1+5=15
9+2=11
9+1+1=11
9+9=18
9+1+8=18
9+5=14
9+1+4=14

3. 在里填上合适的数。
(1)
(2)
(3)
(4)

(1)
$9 + 5 = \boxed{14}$
$\quad \quad \swarrow \searrow$
$\quad \boxed{1} \quad \boxed{4}$
$\quad \quad 10$
(2)
$9 + \boxed{3} = \boxed{12}$
$\quad \quad \swarrow \searrow$
$\quad \boxed{1} \quad 2$
$\quad \quad 10$
(3)
$\boxed{9} + \boxed{9} = \boxed{18}$
$\swarrow \searrow$
$1 \quad 8$
$10$
(4)
$\boxed{9} + \boxed{7} = 16$
$\swarrow \searrow$
$1 \quad \boxed{6}$
$10$