In this topic, students will:
use properties of addition and strategies to solve problems mentally
use rounding or compatible numbers to estimate sums and differences
model sums and differences of decimals
add decimals to hundredths using familiar strategies, such as partial sums
subtract decimals to hundredths using familiar strategies, such as partial differences
Subtract decimals to hundredths using familiar strategies, such as partial differences
Vocabulary:
Compatible numbers - numbers that are easy to compute mentally.
Compensation - adjusting one number to make computation easier and balancing the adjustment by changing another number.
Commutative property of addition - addends can be added in any order and the sum remains the same.
Associative property of addition - addends can be regrouped and the sum remains the same.
At-home Practice: (This game comes from Math Geek Mama)
Supplies:
a deck of cards
The object of this game is to be the first person to collect ten cards that exactly equal $1.00.
In this game, Ace = $0.01, Two = $0.02, Three = $0.03, … Tens = $0.10, Jack = $0.11, Queen = $0.12 and King = $0.13.
To begin, shuffle the deck and deal ten cards to each player. Players then take turns drawing and discarding one card at a time until the deck of cards is depleted or a player collects exactly $1.00. This means it will involve a bit of logic and problem-solving as kids learn to discern which cards to keep and which to discard, as well as thinking through possible ways to collect $1.00.The first player to collect ten cards that equal $1.00 wins that round and earns 1 point. If no one has $1.00 after the deck is depleted, the person closest (without going over) earns .5 of a point. The player with the most points at the end of ten rounds wins!