Virginia SOL 4.CE.4.a.ii
The Standard
addends, subtrahends, and minuends are limited to four digits.
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 and find sums or differences of decimals through thousandths. They use place-value models, compatible numbers, rounding, or a written algorithm and explain why answers are reasonable.
What Mastery Looks Like
- Students align decimal points, use placeholder zeros when helpful, and calculate accurately. They estimate first and use that estimate to judge whether the exact answer makes sense.
Common Misconceptions
- Students may line up the last digits instead of the decimal points. They may regroup incorrectly across zeros or treat a longer decimal as automatically larger.
How to Assess It
- Ask: “Estimate 7.205 minus 2.86, then find the exact difference. Show how your estimate confirms that your answer is reasonable.”
Lesson moves
Ways to Teach It
Have pairs build 3.426 and 1.758 with base-ten blocks on place-value mats, then combine and regroup to find the sum.
Ask students to explain why 6.2 minus 1.875 requires writing 6.200 before using the standard subtraction algorithm.
Play Decimal Match by having students pair each calculation card with its estimate and exact answer cards.
Give two race times measured to thousandths of a second and have students calculate and explain the difference between them.
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Printable 4.CE.4.a.ii Worksheet
A ready-to-print activity worksheet aligned to 4.CE.4.a.ii, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 5.CE.4.a.iii
whole numbers will be limited to two digits or less; and
- 5.CE.1.b.i
sums, differences, and products do not exceed five digits;
- 3.CE.1.b
Apply strategies (e.g., rounding to the nearest 10 or 100, using compatible numbers, using other number relationships) to estimate a solution for single-step or...
- 5.CE.4.a.ii
simplification will be limited to five whole numbers and four operations in any combination of addition, subtraction, multiplication, or division;
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