Evaluate Expressions With Signed Decimals

Start with the error hunt so students see what correct work looks like, then move to decimals and fractions. Have students rewrite each substitution with parentheses before they calculate.

Substitute signed decimals into expressions such as 3.5a + 2 and −0.5(m + 4.2), then write each value. The directions on the page read: Substitute the given values and show your work. Write the value on the line. An answer key is included.

Yes, both. We made it for 7th grade algebra, and it works the same at home or at school. At home, a student can work through it alone and then go over it with you, which shows quickly what is solid and what needs another look. In class it works as independent practice, homework or a warm-up, and you can print one copy or a full set.

Replace each variable with its given number, then follow the order of operations. For 2x − 3 with x = −4, the work is 2(−4) − 3 = −8 − 3 = −11. Find the Error in Evaluating Integer Expressions shows this kind of work on the page.

Put the negative number in parentheses so the sign stays with it, as in 3(−1.2). Then multiply and add as usual. Evaluate Expressions With Signed Decimals uses values such as a = −1.2 and m = −6.2.

Students often drop a sign, such as writing 5 − 2(−4) as 5 − 8 instead of 5 + 8. Find the Error in Evaluating Integer Expressions has students find the one line with a mistake like this and write the correct value.