Virginia SOL 4.CE.4.a

4.CE.4.a is a Standards of Learning standard. These are the knowledge and skills expectations under it.

• 4.CE.4.a.i

  decimals do not exceed the thousandths

• 4.CE.4.a.ii

  addends, subtrahends, and minuends are limited to four digits.

01

What Students Need to Do

Students estimate decimal sums and differences using rounding or compatible numbers. They align place values and calculate exact answers, with drawings or written algorithms. They use estimates to check reasonableness.

02

What Mastery Looks Like

Students choose a useful estimation strategy and calculate accurately. They align decimal points, use placeholder zeros when needed, and explain why the exact answer is reasonable.

03

Common Misconceptions

Students may align digits from the right instead of aligning decimal points. They may forget to add placeholder zeros or regroup across the decimal point. Some treat an estimate as the exact answer.

04

How to Assess It

Give this exit ticket: “Estimate, then solve 8.347 − 2.58. Show place-value alignment and explain how your estimate checks the answer.”

1. 01

   Give pairs digit cards and place-value mats to build two decimals, align them, estimate, and calculate their sum or difference.

2. 02

   Ask students to explain why 6.4 + 2.375 should be written as 6.400 + 2.375 before calculating.

3. 03

   Play Decimal Target: students draw number cards, create two decimals, and earn points when their estimated and exact sums reach a target.

4. 04

   Use race times recorded to thousandths, then have students find combined split times and differences between two runners.

• 2.CE.1.a

  Apply strategies (e.g., rounding to the nearest 10, compatible numbers, other number relationships) to estimate a solution for single-step addition or subtracti...

• 5.CE.3.a

  Apply estimation strategies (e.g., rounding to the nearest whole number, tenth or hundredth; compatible numbers, place value) to determine a reasonable solution...

• 3.CE.1.c

  Apply strategies (e.g., place value, properties of addition, other number relationships) and algorithms, including the standard algorithm, to determine the sum ...

• 4.CE.1.b

  Apply strategies (e.g., rounding to the nearest 100 or 1,000, using compatible numbers, other number relationships) to estimate a solution for single-step or mu...