一、Addition/əˈdɪʃ.ən/：加法
Two plus two is four. 2 2=4
Vocabulary：词汇
plus/plʌs/：加，加上
is/iz/：等于
Examples:
Two plus two is four. 2 2=4
Three plus three is six. 3 3=6
Four plus three is seven. 4 3=7
Nine plus eight is seventeen. 9 8=17
二、Subtraction/səbˈtræk.ʃən/：减法
Four minus two is two. 4-2=2
Vocabulary：词汇
minus/ˈmaɪ.nəs/：减去
is/iz/：等于
Examples:
Four times three is twelve. 4X3=12
Vocabulary：词汇
times/taɪmz/：乘以
is/iz/：等于
Examples:
Four times three is twelve. 4X3=12
Five times two is ten. 5X2=10
Eight times seven is fifty-six. 8X7=56
Nine times nine is eighty-one. 9X9=81
四、Division/dɪˈvɪʒ.ən/：除法
Six divided by two is three. 6÷2=3
Vocabulary：词汇
divided by：用…除…
is/iz/：等于
Examples:
Six divided by two is three. 6÷2=3
Fifteen divided by 5 is three. 15÷5=3
Sixty-four divided by eight is eight. 64÷8=8
Eighty-one divided by nine is nine. 81÷9=9
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