Math Intervention 3–5 Grade

206 Multifaceted Number Concepts

PLAYERS:

2 OR MORE

P rime Time

A game designed to build the concepts

of prime and composite numbers

Materials:

Q Dry erase board and marker for each player

Q 0–9 Number Cards copied on yellow paper

(see page 72)

Q 0–9 Number Cards copied on green paper

(see page 72)

Directions:

1. Players shuffl e each set of number cards and place them face
   down in two piles.


2. To begin the fi rst round, a player chooses one yellow number
   card and one green number card to make a 2-digit number. The
   yellow card serves as the tens digit and the green card serves as
   the ones digit. Note: If a yellow zero is drawn, the number will be a
   single digit number.


3. If the number formed with the cards is a prime number, the
   player earns fi ve points and the turn is complete. If the number
   formed is a composite number, the players race to draw factor
   trees for the number on dry erase boards. The fi rst player to
   complete the factor tree calls out “Prime Factorization Com-
   plete!” If her factor tree is accurate, she earns ten points. If the
   factor tree is not accurate, she earns zero points.


4. Players continue taking turns choosing cards, identifying prime
   numbers, drawing factor trees, and keeping a running total.


5. The fi rst player to reach a score of 50 calls out “Prime Time” and
   is the winner. Note: Number cards can be shuffl ed and reused.

Content Differentiation:

Moving Back: Play this game using dice (labeled 1–6) instead of

0–9 number cards.

Moving Ahead: Players write equations with exponents after they

draw the factor trees.