1. 5 + 2 + 3 = □
$\begin{array}{c}\underline{\quad\quad}\\ □\end{array}\begin{array}{c}\underline{\quad\quad}\\ □ 3 + 4 + 1 = □\begin{array}{c}\underline{\quad\quad}\\ □\end{array}\begin{array}{c}\underline{\quad\quad}\\ □ $
6 + 2 + 1 = □
$\begin{array}{c}\underline{\quad\quad}\\ □\end{array}\begin{array}{c}\underline{\quad\quad}\\ □ $

7 10 7 8 8 9

2. $4 + 0 + 5 = □$
$3 + 4 + 3 = □$
$2 + 3 + 4 = □$
$9 - 2 - 3 = □$
$10 - 6 - 4 = □$
$10 - 3 - 5 = □$

9 10 9 4 0 2

二、连一连。
| $2 + 2 + 2$ | $9$ | $3 + 2 + 3$ | $7$ |
| $8 - 3 - 2$ | $6$ | $9 - 2 - 2$ | $8$ |
| $5 + 3 + 1$ | $3$ | $2 + 3 + 2$ | $5$ |

三、看图列式并计算。
1.
$□ ◯ □ ◯ □ = □$(只)
2.
$□ ◯ □ ◯ □ = □$(只)
3.
$□ ◯ □ ◯ □ = □$(颗)
4.
$□ ◯ □ ◯ □ = □$(个)

1.10 - 4 - 2 = 4　2.5 + 2 + 1 = 8 3.3 + 3 + 4 = 10　4.8 - 2 - 5 = 1