In this topic, students will:
use a number line to subtract
make subtraction easier by making 10 to subtract
count on to subtract
make addition and subtraction facts using the same three numbers (fact families)
use addition facts to find subtraction facts
explain strategies used to solve subtraction problems
solve addition and subtraction problems with unknowns
Vocabulary:
Related facts - addition facts and subtraction facts that have the same numbers are called related facts
Fact family - a group of related addition and subtraction facts
At-home Practice:
Supplies:
deck of cards (Remove the face cards)
(3 players needed) Select one person to be the Operator. The other 2 people are the players. Place all cards facedown in a pile. Player 1 turns over a card and the Operator chooses an operation and number to use. (ex. Player 1 turns over a 5. The Operator says, “Subtract 3!”) The first player to correctly answer receives the card. Player 2 selects the card for the next round. The Operator can keep or change the operation and number each round. Keep playing until all cards are used. The player with the most cards at the end is the winner!