Lesson 12-4

LET'S BUILD Count by Tens to 100

For more help with this lesson, view the Visual Learning Animation or the Another Look Video.

MATH HELP AT HOME

Sample Additional Practice Exercise 1

Color the boxes of the following decade numbers: “twenty, thirty, fifty, seventy, eighty, one hundred.”

A number chart from 1 to 30, with 10 numbers in each row. The boxes for the numbers 20, 30, 50, 70, 80, 100 are shaded.

Twenty, thirty, fifty, seventy, eighty, and one hundred are all decade numbers. Decade numbers end in zero and are in the last column of the chart. Color the boxes for 20, 30, 50, 70, 80, and 100.

HOME ACTIVITY

Count Groups of 10

MATERIALS

Small Objects

ACTIVITY

Arrange 30 objects, such as pennies, beads, or other small objects, in groups of 10 on a table. Ask your child to use decade numbers to count the number of objects aloud. Repeat with up to 10 groups of objects.