2-min Fluency Warm-up — Solve in your head.
16 − 9 =
7 + 7 =
11 − 6 =
8 + 5 =
Measure each line twice: once in inches, once in centimeters.
Inches: Centimeters:
Inches: Centimeters:
Inches: Centimeters:
Number Talk — Explain WITHOUT measuring anything new.
When you measured line B, you got a bigger number in centimeters than in inches. But the line did not change! Why is the cm number bigger?
My thinking:
Hint: think about which unit is smaller.
How much longer is the first object? Subtract to find out.
A rope is 45 cm long, and a stick is 28 cm long.
45 − 28 = cm longer
A table is 60 inches long, and a chair is 34 inches long.
60 − 34 = inches longer
A snake is 52 cm long, and a lizard is 19 cm long.
52 − 19 = cm longer
A slide is 96 inches long, and a bench is 48 inches long.
96 − 48 = inches longer
Create Your Own
Draw a line below that you think is exactly 4 inches long — no ruler while you draw! Then measure it. How close were you?
My line measured: inches
How far off was I?