Measure & Add Length (Intro to the Ruler)

13. I took 4 from 7 to make a ten. 10 + 3 = 13.

55. I added 10 then 1. 44 + 10 = 54. 54 + 1 = 55.

21. I took away 6 to make a ten, then took away 1 more. 26 – 6 = 20. 20 – 1 = 19.

Length is how long something is from one end to the other.

The first line. When they are lined up on the left side the first line goes farther to the right.

Use paperclips that are all the same size. Line up the paper clips from one end of the object to the other. Don’t overlap the paper clips or leave any space between them. Count how many paper clips you used. That’s how many paper clips long the object is.

Line up the zero mark on the ruler with one end of the object. The number next to the other end of the object is its length. If the ruler shows inches, the length is in inches.

I should use a yardstick to measure objects that are longer than a ruler.

Inches and feet are units of measurement that I can use to describe the length of an object. Feet are longer than inches, so an object that is 1 foot long is longer than an object that is 1 inch long.

Measure the lengths of both chocolate bars. Subtract the shorter length from the longer length to find how much longer one chocolate bar is than the other. Add the lengths to find the combined length.