Measure from 0 each time. A centimeter is shorter than an inch, so it takes more of them to cover the same length: the smaller the unit, the bigger the number.
unitthe size you measure with
inchthe longer of the two units
centimeterthe shorter unit
lengthhow long something is
Watch for: Thinking the thing got longer because the number is bigger. Circling centimeter as the longer unit. Using the same side of the ruler for both measurements.
At home: Measure a book with paperclips and then with crayons. Ask why it took more paperclips.
Sample sheet and answer key
Freddie's Frog Pond
Grade 2 · Measuring in two units · 2.MD.A.2
NameDate
Freddie the frog lives in a busy pond full of bugs, lily pads and friends. Solve each problem to help Freddie out!
Measure it twice
Each thing, measured in inches and then in centimeters.
inches
centimeters
inches
centimeters
Why is one number bigger?
Circle the answers.
Which unit is longer?an incha centimeter
Which unit takes more of them to measure the same thing?inchescentimeters
Did the thing change length?yesno
Sheet
Freddie's Frog Pond
Grade 2 · Measuring in two units · 2.MD.A.2
Answer key
Freddie the frog lives in a busy pond full of bugs, lily pads and friends. Solve each problem to help Freddie out!
Measure it twice
Each thing, measured in inches and then in centimeters.
4inches
10centimeters
2inches
5centimeters
Why is one number bigger?
Circle the answers.
Which unit is longer?an incha centimeter
Which unit takes more of them to measure the same thing?inchescentimeters
Did the thing change length?yesno
Answer key
New problems every time, three levels (gentle, core and stretch), themes to pick from, a second page if you want one. Each sheet comes with an answer key and a one-page guide for grown-ups.