3A - Tricks in addition and subtraction

How do feel today?

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Which two numbers make tens?

• 1 and 8

• 3 and 7

• 4 and 6

• 2 and 5

 $A-B-C=?$  

•  $A-\left(B+C\right)$  

•  $\left(A+B\right)-C$  

•  $B-\left(A+C\right)$  

•  $A-\left(B-C\right)$  

 $A-\left(B-C\right)=?$  

•  $A-B-C$  

•  $A-B+C$  

•  $B-A+C$  

•  $C-A+B$  

Hàng

(Start with letter R)

Cột

(Start with letter C)

Đường chéo

(Start with letter D)

Hiệu

(Start with letter D)

Số hạng

(Start with letter A)

Tổng cộng

• In all

• In total

• Altogether

• subtraction