6.NS.B.3

DeciMagic Hero

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Game Info for Teachers

COMBINED RATING

4.3 Stars

TEACHERS (8)

4.6

STUDENTS (856)

3.9

LENGTH

30 Minutes

GRADES

CAPABILITIES

Spanish Language Support

Text-to-Speech Support

Saves Progress

Description

Use the power of mathematics and arcane magic to free the kingdom from the grasp of the Evil Wizard. Choose your spells, pick your items and plan your path carefully in each mission and become the hero that will save the day!

Vocabulary Words

decimals

decimal points

tenths

hundredths

thousandths

place value

addition

subtraction

borrow

carry

greater than

less than

estimation

multiplication

division

Instructions

Play through this interactive game to learn about Arithmetic with Decimals. Suitable for Grade 6, Grade 7, Grade 8.

Main Concepts

Use place value knowledge when multiplying decimals (A tenth by a tenth will yield a product of a hundredth).

The process of composing and decomposing a base-ten unit is the same for decimals as for whole numbers and the same methods of recording numerical work can be used with decimals as with whole numbers.

General methods used for computing quotients of whole numbers extend to decimals with the additional issue of placing the decimal point in the quotient.

Use the same place value understanding for adding and subtracting decimals used for adding and subtracting whole numbers.

Base-ten units must be added and subtracted, so students need to attend to aligning the corresponding places correctly (this also aligns the decimal points).

General methods used for computing products of whole numbers extend to products of decimals.

A whole number is not usually written with a decimal point, but a decimal point followed by one or more 0s can be inserted on the right (e.g., 16 can also be written as 16.0 or 16.00). This reasoning can be used to put 0s in places so that all numbers show the same number of places to the right of the decimal point.

When multiplying the decimal place values can be added and then added to the product (32.4 x 16.8 can be multiplied as 324 x 168 and then move the decimal the 2 place values left in the product).

When multiplying by 0.1 and by 0.01, explain why the product is ten or a hundred times as small as the multiplicand (moves one or two places to the right). Extend reasoning to multipliers that are single-digit multiples of 0.1 and 0.01 (e.g., 0.2 and 0.02, etc.).

Decimals are not limited and expectations for factors students will multiply tenths with tenths and tenths with hundredths and thousandths by thousandths.

Use a standard algorithm to subtract multi-digit decimals.

Use a standard algorithm to add multi-digit decimals.

Use a standard algorithm to multiply multi-digit decimals: 1-digit x 2-digit, 1-digit x 3- digit, 2 digit x 3-digit, 2-digit x 4-digit, or 2-digit x 5-digit.

Use a standard algorithm to divide multi-digit decimals: 4-digit divided by 2-digit or 3-digit divided by 3-digit.

Discussion Questions

Before the Game

What do decimals represent? What are the place values to the right of the decimal? What are some strategies you use when comparing two numbers?

After the Game

Before you add or subtract two numbers, what do you need to do to the decimals of those numbers? How did you use your powers of estimation to decide whether you wanted to fight or leave the enemy? How is multiplication of decimals different from addition and subtraction? Where do you move the decimal points in the two numbers that you are dividing?

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Ratings Breakdown

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Game Details

Difficulty

Content Integration

Lexile Level

905

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