题目内容
数一数，算一算，并改错。
1. 
－ 
= six _____________
－ 
= six _____________2. 
+ 
= thirteen _____________
3. 
+ 
= nineteen _____________
+ 
= nineteen _____________4. 
+ 
= four _____________
+ 
= four _____________1. five 2. fifteen 3. nine 4. fourteen
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