Line one end of the object up with 0. Read the number at the other end. That number of units is the length.
lengthhow long something is
incha unit of length, about a paperclip
centimetera smaller unit, about a fingertip wide
rulera strip marked in equal units
Watch for: Lining up with 1 or the edge of the ruler instead of 0. Reading the inch side for a centimeter answer. Leaving off the unit: 4 inches, not just 4.
At home: Measure small things together with a ruler, like a spoon, a crayon or a toy car. Check where the 0 is before reading.
Sample sheet and answer key
Freddie's Frog Pond
Grade 2 · Measuring with a ruler · 2.MD.A.1
NameDate
Freddie the frog lives in a busy pond full of bugs, lily pads and friends. Solve each problem to help Freddie out!
Inches
Line up the end with 0. Read the number at the other end.
inches
inches
inches
Centimeters
Same way, smaller units.
centimeters
centimeters
centimeters
Sheet
Freddie's Frog Pond
Grade 2 · Measuring with a ruler · 2.MD.A.1
Answer key
Freddie the frog lives in a busy pond full of bugs, lily pads and friends. Solve each problem to help Freddie out!
Inches
Line up the end with 0. Read the number at the other end.
3inches
4inches
3inches
Centimeters
Same way, smaller units.
11centimeters
10centimeters
8centimeters
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.