Virginia SOL 4.CE.4.a.i
The Standard
decimals do not exceed the thousandths
Virginia Standards of Learning for Mathematics · The student will estimate, represent, solve, and justify solutions to single-step and multistep problems, including those in context, using addition and subtraction of decimals through the thousandths, with and without models.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students estimate decimal sums and differences by rounding or using compatible numbers. They find exact answers by aligning decimal points and using models or a written algorithm. They check that answers fit their estimates.
What Mastery Looks Like
- Students correctly add and subtract decimals with different numbers of decimal places. They choose a useful estimate, show accurate work, and use the estimate to check reasonableness.
Common Misconceptions
- Students may line up the last digits instead of the decimal points. They may forget placeholder zeros, regroup incorrectly across the decimal, or treat an estimate as the exact answer.
How to Assess It
- Exit ticket: Estimate 4.782 − 1.956, find the exact difference, then explain in one sentence why the answer is reasonable.
Lesson moves
Ways to Teach It
Give pairs place-value mats and digit cards to build, add, and regroup decimals such as 2.347 and 1.586.
Ask students to compare rounding and compatible-number estimates for 6.238 + 2.761, then defend which estimate is more useful.
Play Decimal Target: students draw digit cards, create two decimals, and add or subtract to get closest to a target.
Use two race times recorded to the thousandth of a second, then estimate and calculate the difference between them.
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Printable 4.CE.4.a.i Worksheet
A ready-to-print activity worksheet aligned to 4.CE.4.a.i, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 5.CE.3.c.ii
quotients may include whole numbers, tenths, hundredths, or thousandths;
- 5.CE.3.c.i
quotients do not exceed four digits with or without a decimal point;
- 5.CE.4.a.iii
whole numbers will be limited to two digits or less; and
- 5.CE.3.c.iii
divisors are limited to a single digit whole number or a decimal expressed as tenths; and
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