Unlock harder levels by getting an average of 80% or higher.

Earn up to 5 stars for each level
The more questions you answer correctly, the more stars you'll unlock!

Each game has 10 questions.
Green box means correct.
Yellow box means incorrect.

Unlock harder levels by getting an average of 80% or higher.

Earn up to 5 stars for each level
The more questions you answer correctly, the more stars you'll unlock!

Each game has 10 questions.
Green box means correct.
Yellow box means incorrect.

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Math Games for Teachers

Grade 5 - Number

Standard 5.N.11 - Solve addition and subtraction sentences with decimals.

Included Skills:

Demonstrate an understanding of addition and subtraction of decimals (to thousandths), concretely, pictorially, and symbolically, by
using personal strategies
using the standard algorithms
using estimation
solving problems

Estimate a sum or difference using front-end estimation (e.g., for 6.3 + 0.25 + 306.158, think 6 + 306, so the sum is greater than 312) and place the decimal in the appropriate place.
Correct errors of decimal point placements in sums and differences without using paper and pencil.
Explain why keeping track of place value positions is important when adding and subtracting decimals.
Predict sums and differences of decimals using estimation strategies.
Solve a problem that involves addition and subtraction of decimals, to thousandths.
Model and explain the relationship that exists between an algorithm, place value, and number properties.
Determine the sum and difference using the standard algorithms of vertical addition and subtraction. (Numbers are arranged vertically with corresponding place value digits aligned.)
Refine personal strategies, such as mental math, to increase efficiency when appropriate (e.g., 3.36 + 9.65 think, 0.35 + 0.65 = 1.00, therefore, 0.36 + 0.65 = 1.01 and 3 + 9 = 12 for a total of 13.01)

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