Fractions•Grade 4•Missing Number

4.NF.5 — Fractions with Denominators 10 and 100

Practice expressing fractions with denominator 10 as equivalent fractions with denominator 100, and add fractions with denominators of 10 and 100 together.

CCSSAligned to Common Core 4.NF.5: Express a fraction with denominator 10 as an equivalent fraction with denominator 100, and add two fractions with respective denominators 10 and 100.

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Three different problem sets — same skill, same layout, fresh numbers.

Preview — Set A

Convert fractions and add fractions with denominators of 10 and 100.

1.
Write 3/10 as an equivalent fraction with denominator 100 =
2.
Write 7/10 as an equivalent fraction with denominator 100 =
3.
Write 1/10 as an equivalent fraction with denominator 100 =
4.
Write 5/10 as an equivalent fraction with denominator 100 =
5.
Write 9/10 as an equivalent fraction with denominator 100 =
6.
Write 2/10 as an equivalent fraction with denominator 100 =
7.
Write 6/10 as an equivalent fraction with denominator 100 =
8.
Write 4/10 as an equivalent fraction with denominator 100 =
9.
Write 8/10 as an equivalent fraction with denominator 100 =
10.
3/10 + 4/100 =
11.
5/10 + 7/100 =
12.
2/10 + 3/100 =
13.
6/10 + 15/100 =
14.
4/10 + 20/100 =
15.
1/10 + 8/100 =
16.
7/10 + 25/100 =
17.
3/10 + 60/100 =
18.
9/10 + 5/100 =
19.
2/10 + 45/100 =
20.
5/10 + 30/100 =
21.
8/10 + 12/100 =
22.
4/10 + 35/100 =

What this worksheet covers

Set A of this grade 4 missing number sheet holds 22 fractions problems on one printable page, with the answer key on the page behind it. Several problems use mixed numbers, which have to be handled without dropping the whole-number part and the numbers run as high as 100. Two problems from the middle of the page — "Write 4/10 as an equivalent fraction with denominator 100" and "1/10 + 8/100" — show the range. It is written against Common Core 4.NF.5 — Number & Operations—Fractions, grade 4.

Skills practiced

At grade 4, fractions is about adding and subtracting like denominators, equivalent fractions, and multiplying by a whole number, and this sheet takes one slice of that. The skill on the page: fractions with Denominators 10 and 100. Concretely, the sheet tests whether a student can work in fractional units and give the answer in lowest terms. Seventeen different answers appear across the 22 problems, so a student cannot copy one result down the page.

About the missing number format

The 22 problems here move the unknown around, so a student solves for a missing part as often as for a result; problem 8, "Write 4/10 as an equivalent fraction with denominator 100" is one of them. A missing numerator or a missing factor asks the student to think about the fraction relationship in reverse.

Set A, Set B and Set C

Set A is the original sheet, and Sets B and C were derived from it problem by problem: each number became a slot redrawn with the same shape, and every answer was recomputed exactly. Where Set A's problem 12 is "2/10 + 3/100", Set B's is "2/10 + 19/100".

How to use this worksheet

Work the 22 problems straight through, then check against the key together rather than handing it back marked; asking a grade 4 student to find their own fractions error teaches more than seeing it circled. Keep the key face down until all 22 problems are finished, then go through the misses together rather than only totaling the score.

One mistake to watch for

Numerators and denominators are added separately: 1/2 + 1/3 is answered 2/5 instead of 5/6. Problem 22 on this grade 4 missing number page, "4/10 + 35/100", is where to look for it.

The fraction is read as two whole numbers stacked, not as a count of a unit.

Use fraction strips and ask what a "fifth" would even be here; halves and thirds are different units and must be renamed before combining.

The full guide to teaching fractionsTeaching fractions from equal shares to rational numbers: the grade 1–8 progression, why the number line matters, and the misconceptions that persist for years.