Lesson 1 - Using Doubling to Multiply

To encourage students to have fun on the Web while learning about Using Doubling to Multiply, here are some games and interactive activities they can do on their own or in pairs.

Goal

Use repeating addition and doubling to multiply.

Builds Upon

Student Book pages 158-159

Instructions for Use

Number Relationships prompts students to use repeated addition.

To use Number Relationships, skip-count by twos, start by pressing the number 2 on the interactive calculator. This number will appear in the calculator window. Press the + button on the calculator, the number 2 becomes shaded on the hundreds board. Press the number 2 again and the = button on the calculator. Keep pressing the = button to show the relationship of repeated addition and doubling to multiplying.

Double the Donuts helps students visualize a doubling strategy.

To use Double the Donuts, click on the 'Double It' button to see how the number of donuts increases. Notice the chart at the right of the program to see how quickly the number of donuts double.

Archery Doubles helps students multiply using a doubling strategy.

To use Archery Doubles, double the number on the board, and click on the correct part of the target.

Doubling a Number helps students visualize the breakdown of multiplication problems and answer them successfully.

To use Doubling a Number, fill in each of the number fields, and then click the 'Check' button until all the number fields are complete. To start a new question, press on 'Do it again?'

The World of 2 allows students to investigate patterns in addition and multiplication using the number 2.

Patterns on the hundreds chart for the World of 2 begin immediately. Click on the queen to get hints about the doubling and halving. Click on the joker to show other number patterns.