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| # | 英语 | 汉语 | |
|---|---|---|---|
| 1 | decompose | v. 拆分 to break apart a number | |
| 2 | difference | n. 差 answer to a subtraction problem | |
| 3 | sum | n. 和 answer to an addition problem | |
| 4 | tape diagram | n. 条状图（胶带图/条形示意图） bar diagram | |
| 5 | variables | n. 变量 letters that stand for numbers and can be added, subtracted, multiplied, and divided as numbers | |
| 6 | halfway | n. 中点 with reference to a number line, the midpoint between two numbers | |
| 7 | endpoint | n. 端点 used with rounding on the number line; the numbers that mark the beginning and end of a given interval | |
| 8 | number line | n. 数轴 a line marked with numbers at evenly spaced intervals | |
| 9 | rounding | n. 四舍五入，取近似值 approximating the value of a given number | |
| 10 | estimate | v. 估算 an approximation of a quantity or number | |
| 11 | addend | n. 加数 a number that is added to another | |
| 12 | algorithm | n. 运算法则 a step-by-step procedure to solve a particular type of problem | |
| 13 | compose | v. 合成 a number is made up of putting together other existing numbers | |
| 14 | expression | n. 表达式 a number, or any combination of sums, differences, products or divisions of numbers that evaluates to a number | |
| 15 | number sentence | n. 数学式子（数句） an equation or inequality for which both expressions are numerical and can be evaluated to a single number | |
| 16 | digit | n. 数位数字（0-9单个数字） any of the numbers 0 to 9 | |
| 17 | expanded form | n. 展开式 the representation of a number as a sum that shows the value of each digit | |
| 18 | word form | n. 文字形式 the form of a number that uses written words | |
| 19 | equal to | phr. 等于 having the same value as | |
| 20 | less than | phr. 小于 an inequality showing the number on the left as less than the number on the right |