Math Intervention 3–5 Grade

Addition and Subtraction Concepts 101

Drop It

A game designed to build the

concept of near tens

Materials:

Q^ Die (labeled 18, 28, 39, 49, 40, 50)

Q^ Plus/Minus Spinner, paper clip and pencil

Q^ Drop It Hundred Chart

Q^ Chip or counter

Directions:

1. The fi rst player spins the spinner to fi nd out if he will add or
   subtract.


2. The fi rst player drops the chip/counter on the hundred chart
   to fi nd one of the numbers in his equation and rolls the die to
   fi nd the other number in the equation. Note: The chip/counter is
   dropped on the 1–50 section (shaded) for addition and the 51–100 sec-
   tion (not shaded) for subtraction. This number serves as the fi rst addend
   or the minuend. The number on the die serves as the second addend or
   the subtrahend. For example, 74 – 39 =? The player touches 74 on
   the hundred chart, moves his fi nger up four rows of ten (– 40)
   and forward one space to the right (+ 1). The player describes
   the near tens situation, for example, 74 – 39 = 74 – 40 + 1.


3. The sum/difference is the player’s positive score for the round.


4. The next player spins the spinner, drops the chip/counter, rolls
   the die, models, and describes the near tens equation.


5. Players add their scores from each round. The winning player
   is the player with the highest score after 10 rounds.

Content Differentiation:

Moving Back: Try the game with a die labeled 8, 8, 9, 9, 10, 10.

Moving Ahead: Try the game with a die labeled 38, 48, 58, 69, 79,

89 using a two-hundred chart.

PLAYERS:

2