Task# Rounding to Tenths and Hundredths

Illustrative MathematicsVaries

The purpose of this task is for students to use the position of a number on the number line to round the number without knowing its exact value. Though this task deals most directly with rounding, it also requires students to understand or figure out that one tenth of 0.1 is 0.01. Teachers should anticipate that students may initially struggle to label the tick marks and may want to offer such guiding questions as, 'How many equal parts is the line segment between 0 and 0.1 split into?' Teachers may also want to encourage students to check their own guesses by writing out the appropriate multiples to see if they work out to 0.1.