Grade 8 Percents Missing Number
Grade 8 percents missing number sheet: 24 problems on percent of a number, finding the whole from a percent.
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Three different problem sets — same skill, same layout, fresh numbers.
Preview — Set A
Find the number that belongs in each blank.
- 1.___% of 200 = 20
- 2.75% of a number is 180. What is the number?
- 3.20% of 400 = ___
- 4.90% of a number is 135. What is the number?
- 5.30% of ___ = 36
- 6.10% of a number is 20. What is the number?
- 7.___% of 40 = 36
- 8.15% of a number is 30. What is the number?
- 9.___% of 100 = 50
- 10.15% of a number is 60. What is the number?
- 11.60% of 150 = ___
- 12.5% of a number is 5. What is the number?
- 13.20% of 200 = ___
- 14.70% of a number is 14. What is the number?
- 15.___% of 150 = 135
- 16.90% of a number is 180. What is the number?
- 17.40% of ___ = 32
- 18.25% of a number is 20. What is the number?
- 19.___% of 100 = 40
- 20.70% of a number is 70. What is the number?
- 21.___% of 150 = 120
- 22.75% of a number is 225. What is the number?
- 23.15% of 150 = ___
- 24.5% of a number is 2.5. What is the number?
What this worksheet covers
There are 24 percents problems here — one page to work, one page of answers to check against — and Sets B and C repeat the layout with different numbers. Within that, each problem arrives as a few sentences of context rather than a bare expression and some operands are decimals rather than whole numbers. Problems 9 and 17, for instance, are "___% of 100 = 50" and "40% of ___ = 32". The sheet sits inside Common Core 7.RP.3, in the grade 7 Ratios & Proportional Relationships strand.
Skills practised
At grade 8, percents is about percent change, simple interest, and multi-step percent problems, and this sheet takes one slice of that. The skills on the page: percent of a number and finding the whole from a percent. Working the page asks a student to read a situation and choose an operation before computing, keep the decimal points aligned, and reason backwards from a result to a missing part. Fourteen different answers appear across the 24 problems, so a student cannot copy one result down the page.
About the missing number format
Each of the 24 problems has a blank, and the blank is not always at the end: problem 9, "___% of 100 = 50" puts it where the student has to reason backwards. Blanking the percent, the whole or the part gives the same relationship three different ways.
Set A, Set B and Set C
All three sets are produced by the site's deterministic generator from a fixed seed, so they are the same every time the site is built and the answer keys are exact. Where Set A's problem 13 is "20% of 200 = ___", Set B's is "50% of 50 = ___".
How to use this worksheet
Expect twenty minutes or so of real attention for 24 problems. At grade 8, percents rewards care over speed — a rushed missing number gets the arithmetic right and the signs or units wrong. If more than a third of the 24 problems come back wrong, stop and step back a grade in percents rather than assigning Set B.
One mistake to watch for
Finding the whole from a part is done by multiplying: "30% of a number is 12" is answered 3.6. On this grade 8 missing number, problem 17 ("40% of ___ = 32") is the kind of item where it shows.
The forward procedure is being run on a reverse question.
Set it up as 30% × ___ = 12 and read it as a missing-factor problem.
Other grade 8 percents formats
The same skill in the other formats available at this grade.
- Drill — Grade 8 Percents Drill, 30 problems
- Timed Drill — Grade 8 Percents Timed Drill, 60 problems
- Mixed Review — Grade 8 Percents Mixed Review, 30 problems
- Word Problems — Grade 8 Percents Word Problems, 10 problems
A step either side
The same format one grade down and one grade up — the easier sheet is often the faster fix when this one is not landing.
- Grade 7 Percents Missing Number — grade 7, 24 problems
Missing Number sheets in other grade 8 topics
No paywall and no account — download any set of this grade 8 percents missing number, and the answers for all 24 problems are in the matching key.