Mathematics Grade 7 15 min

What decimal number is illustrated?

What decimal number is illustrated?

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1

Introduction & Learning Objectives

Learning Objectives Identify the value represented by base-10 blocks for tenths, hundredths, and thousandths. Translate visual representations (like shaded grids or number lines) into their corresponding decimal numbers. Distinguish between the whole number and fractional parts of a decimal illustration. Express illustrated decimals using correct place value terminology. Convert illustrated fractional parts into decimal notation. Accurately write the decimal number shown in various visual models. Ever seen a pie chart or a progress bar? 📊 Decimals are everywhere, showing parts of a whole! In this lesson, you'll learn how to 'read' pictures and models to figure out the exact decimal number they represent. This skill is crucial for understanding quantities in...
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Key Concepts & Vocabulary

TermDefinitionExample DecimalA number that uses a decimal point to show parts of a whole, where each digit to the right of the decimal point represents a fraction with a denominator of 10, 100, 1000, and so on.0.5 (five tenths), 3.25 (three and twenty-five hundredths) Place ValueThe value of a digit based on its position in a number. For decimals, positions to the right of the decimal point represent fractional parts.In 0.34, the '3' is in the tenths place (0.3), and the '4' is in the hundredths place (0.04). TenthsOne part out of ten equal parts of a whole (1/10). It is the first place value to the right of the decimal point.A grid with 10 squares, 3 shaded, represents 0.3. HundredthsOne part out of one hundred equal parts of a whole (1/100). It is the second place va...
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Core Formulas

Place Value Rule for Decimals $... \text{hundreds} \text{ tens} \text{ ones} . \text{ tenths} \text{ hundredths} \text{ thousandths} ...$ Each position to the right of the decimal point represents a fraction with a denominator that is a power of 10 (10, 100, 1000, etc.). Understanding this order is key to correctly reading illustrated decimals. Interpreting Shaded Grid Models $\text{Decimal} = \frac{\text{Number of shaded parts}}{\text{Total number of equal parts}}$ To find the decimal, count the total number of equal parts in the grid (e.g., 10 for tenths, 100 for hundredths) to determine the denominator, then count the shaded parts for the numerator. Convert this fraction to a decimal. Interpreting Base-10 Block Models $\text{Total Value} = (\text{Number of 'one...

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Sample Practice Questions

Challenging
Model A shows 1 'ones' block and 3 'tenths' rods. Model B is a 10x10 grid with 45 squares shaded. What decimal represents the difference between the value of Model A and Model B?
A.1.75
B.0.85
C.0.15
D.1.25
Challenging
A 10x10 grid currently has 3 full rows and 8 squares in the fourth row shaded. How many MORE squares must be shaded to illustrate the decimal 0.62?
A.38
B.62
C.36
D.24
Challenging
Model X is a bar divided into 10 equal parts with 6 parts shaded. A new, larger model is constructed showing 2 'ones' blocks and a number of 'tenths' rods equal to the number of shaded parts in Model X. What decimal does the new model illustrate?
A.2.06
B.6.2
C.2.6
D.26.0

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