Measurement•Grade 2•Missing Number

Grade 2 Measurement Missing Number

Grade 2 measurement missing number sheet: 24 problems on feet and inches, meters and centimeters, missing lengths.

CCSSAligned to Common Core 2.MD.3: Estimate lengths using units of inches, feet, centimeters, and meters.

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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.
___ kg = 12000 g
2.
___ cm - 21 cm = 39 cm
3.
6 min = ___ sec
4.
___ cm - 29 cm = 11 cm
5.
___ min = 300 sec
6.
___ in - 24 in = 28 in
7.
2 yd = ___ ft
8.
___ in - 17 in = 32 in
9.
___ pt = 16 cups
10.
___ cm - 30 cm = 20 cm
11.
___ kg = 8000 g
12.
___ in - 9 in = 11 in
13.
10 hr = ___ min
14.
___ cm - 15 cm = 16 cm
15.
___ cm = 120 mm
16.
___ in - 25 in = 24 in
17.
___ gal = 32 qt
18.
___ cm - 12 cm = 33 cm
19.
___ hr = 360 min
20.
___ cm - 28 cm = 35 cm
21.
___ lb = 160 oz
22.
___ in - 19 in = 16 in
23.
___ gal = 36 qt
24.
___ in - 23 in = 32 in

What this worksheet covers

This is a 24-problem missing number for grade 2 measurement, printed in black and white with the key on page two. The blank moves between positions from problem to problem, so no single procedure clears the page and the numbers run as high as 12,000. Problems 9 and 17, for instance, are "___ pt = 16 cups" and "___ gal = 32 qt". Common Core 2.MD.3 is the slot this page fills.

Skills practiced

Grade 2 measurement means adding and subtracting lengths, feet and inches, meters and centimeters, and time to the half hour. The skills on the page: feet and inches, meters and centimeters and missing lengths. Working the page asks a student to reason backwards from a result to a missing part. Nineteen 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, "___ pt = 16 cups" puts it where the student has to reason backwards. A missing side, dimension or unit count reverses the formula, which is the only way to check it is understood.

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 "10 hr = ___ min", Set B's is "___ m = 400 cm".

How to use this worksheet

Five focused minutes beats twenty distracted ones at grade 2. Fold this missing number in half, do one part of the 24 problems today and the rest tomorrow, and let the student use fingers or counters if they want them. Date the missing number before filing it. Set C from six weeks later is the cheapest evidence you have that the measurement stuck.

One mistake to watch for

A conversion multiplies when it should divide: 36 inches is answered 432 feet instead of 3 feet. Problem 5 on this grade 2 missing number page, "___ min = 300 sec", is where to look for it.

The direction of the conversion is not being reasoned about.

Ask "should the answer be a bigger number or a smaller one?" before touching the factor; feet are bigger units so there are fewer of them.