standard_description: Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a number line diagram.
problem_activity: Solve. Show or explain your work.
a.   42 × 3
b.   6 × 215
c.   2,039 × 8


aligns: no