Remember: Undo the one operation, and do the same to both sides.
Undo one step
1
The tape shows x + 9 = 15. What is x? Answer:
2
Mia had some stickers. She got 8 more. Now she has 20. How many did she have at first? Answer:
3
Which equation fits this tape?
n − 6 = 136n = 13n + 6 = 13n + 13 = 6
4
The tape shows 4x = 20. Four equal parts make 20. What is x? Answer:
5
What undoes adding 11?
add 11 againsubtract 11multiply by 11divide by 11
6
To solve x ÷ 3 = 4, you divide both sides by 3.
TrueFalse
Fractions and decimals
7
x + 1/9 = 5/9. The bar shows 5/9. What is x? Answer:
8
x + 4.8 = 5.1. What is x? Answer:
9
A ribbon 20.7 meters long is cut into 9 equal pieces. How many meters long is each piece? Answer:
10
The 5 shaded parts of the bar together are worth 10. How much is the whole bar, all 8 parts? Answer:
Match, check and stretch
11
Join each equation to the step that solves it.
1x + 7 = 12
2x − 7 = 12
37x = 14
4x ÷ 7 = 2
Asubtract 7 from both sides
Bmultiply both sides by 7
Cdivide both sides by 7
Dadd 7 to both sides
12
Leo had some ribbon. He bought 1/2 meter more. Now he has 7/8 meter. How many meters did he have at first? The dot marks 7/8. Answer:
13
Check that x = 5 works in x + 11 = 16. Write how you know the two sides balance.
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