Halving fun!

Summary

Students practice halving numbers within 20 in a race to reach 30.

Curriculum content

• Find half of an amount within 20

Materials

Card sets

• 1 set of Mathletics number cards 2 to 20 (only even numbers) 2-20

Concrete

• 2 different colored counters

Printables

• Number line from 0 to 30 Download number line 0-30 - USL Download number line 0-30 - Tabloid

How to play

Set-up

1. Arrange students into pairs.
2. Remove all odd numbers from the Mathletics number card set.
3. Shuffle or mix up the cards and place them in a pile face down.
4. Each student places their counter on 0 on the number line

Rules

1. Player 1 turns over a card.
2. Player 1 halves the number shown on the card and moves their counter that many spaces.
3. Player 2 turns over a card.
4. Player 2 halves the number shown on the card and moves their counter that many spaces.
5. Play continues until each player has had 5 turns.
6. If a player would go beyond 30 if their number was added, they need to subtract instead.
7. The winner is the player closest to 30 after 5 turns.

Variations

CHANGE it down

• Use Mathletics number cards 1 to 10 (even numbers only) and race to 20.
• Provide extra counters or objects for calculating halves.

CHANGE it up

• The winner is the first person to land on 30 exactly.

What to look for

• Are students able to fluently halve numbers within 20?
• Do students rely on concrete resources?