Bill and Bernie demonstrate how to count a large number of objects by grouping pennies into tens and remaining units. Bernie is counting the pennies in her piggy bank. She counts them in piles of ten. She has four piles of ten coins and five remaining, making a total of 45 coins.
Students could be given a large number of pennies or other objects which they could count by grouping into tens and left over units. Discuss why this is an effective way of counting and suggest real life scenarios where this skill might be useful.