Counting in Groups of 10
1. Count in groups of TEN. Count ten dots, and circle them.
Write how many
“tengroups” that you get. Write how many ones are left over.







2. Counting game
1. (Optional  to give more
practice for making groups of ten.) Put some
beans
or other objects onto a table. Ask the child to make groups of ten.
Then ask the child
to count the groups of ten and the individual ones, using
“fourtens and six” or
“seventens
and one”, etc. Repeat as
necessary with a different amount of objects, taking turns.
3. Counting game 2. You need: Counting items, such as sticks, beads, or beans.
Small bags or bowls, OR rubber bands
if using sticks.
Before the game: Place 10 of the items in the middle, and the rest in a pile on the side.
Play: At his turn, each player adds one more item to the
middle pile on the table, and names
the number that is formed. Whenever a whole ten is fulfilled, those ten
items are grouped
together with a rubber band or by placing them in a small bag
or bowl.
ONLY use words
one to ten when counting in this game. Words like eleven, thirteen, twenty,
fifty etc. are not allowed. For example, eleven is said
as “ten and one”, twelve is “ten and
two”, twenty is
“two tens”, twentyfive is “two tens and five”,
etc.
Variation: Each player adds two (or some other quantity) matches to the pile instead of one.
4.
Introduce the 100bead abacus to the student.
Make these numbers with the 100bead abacus.
a. 6 tens, 5 ones b. 2 tens, 7 ones c. 7 tens d. 1 ten, 5 ones 
e. 2 tens, 1 one f. 8 tens, 9 ones g. 9 tens, 3 ones h. 1 ten, 1 one 
i. 4 tens, 6 ones j. 6 tens k. 7 tens, 1 one l. 1 ten, 8 ones 
5.
Take turns telling each other what number to make on the abacus,
such as “7 tens and 9” or “1 ten and 7”. Do not proceed
further until the student
has mastered this! This is crucial.
The names of the numbers with whole tens are:


ten tens = one hundred 
6.
Say the number names from ten to a hundred aloud a few times, while also making
them with the 100bead abacus. It almost sounds like a rhyme!
This lesson is taken from Maria Miller's book Math Mammoth Place Value 1, and posted at www.HomeschoolMath.net with permission from the author. Copyright © Maria Miller.
Math Mammoth Place Value 1
A selfteaching worktext for 1st grade that covers forming tengroups, filling the 100chart, breaking numbers to tens & ones, and comparing.
Download ($3.30). Also available as a printed copy.