##### 2nd Grade

### Math Warm-Ups

(From Steve Wyborney)

Splat through 10:

Splat through 20

Multiple Splats

Number and Operations in Base Ten: Addition and Subtraction

The four games that can be played with this applet help to develop counting and addition skills.

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Students select a target number between 10-20 and find missing addends to make the target number.

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Adding strings of addends.

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Students use their knowledge of addition, place value, and strategic thinking to try to get as close to 1,000 as possible.

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Students use their knowledge of addition, place value, and deductive reasoning to determine what the secret two-digit number is.

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Students practice subtraction within 1,000 as they race to get to zero.

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La Diferencia Más Grande Gana (Spanish)

Students build procedural fluency with subtraction by finding the difference between 2-digit numbers or 3-digit numbers.

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La Suma Más Grande Gana (Spanish)

Students build procedural fluency with addition by finding the sum of 2-digit numbers or 3-digit numbers.

Open Middle Task: Create an Equation

Students use only the digits 1 to 7, at most one time each, to fill in the boxes to create a true equation.

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Open Middle Task: Adding Two-Digit Numbers (Elementary)

Students use the digits 1 to 9 at most one time each, to fill in the boxes to make the smallest (or largest) sum.

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Open Middle Task: Subtracting Two-Digit Numbers (Elementary)

Students use the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) difference.

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Open Middle Task: Adding and Subtracting Two-Digit Whole Numbers

Students use the digits 0 to 9, at most one time each, to make a true statement.

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3-Act Task Virtual Facilitation Guide

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Recommended 3-Act Tasks:

(3-Act Task by Graham Fletcher)

Addition & Subtraction Within 100

(3-Act Task by Graham Fletcher)

Addition & Subtraction Within 1000

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Five-in-a-Row: Subtraction with Three Cubes

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Close to 100 (printable)