Virginia SOL Math / Grade 4 / Computation & Estimation

4.CE.1

Add & Subtract Whole Numbers

What you'll learn

  • Estimate sums and differences of multi-digit whole numbers
  • Add and subtract using the standard algorithm
  • Solve single-step and multistep problems in context

Words to know

Sum —
the answer to an addition problem
Difference —
the answer to a subtraction problem
Estimate —
a close, reasonable answer using rounding
Regroup —
trade 10 in one place for 1 in the next place

Why it matters Adding and subtracting larger numbers lets us total costs, track savings, and find how much is left over.

Worked examples

Model ItI do

Estimate, then find 3,472 + 2,859.

Estimate first: 3,000 + 3,000 = 6,000. Now add exactly, regrouping as needed: 3,472 + 2,859 = 6,331. That is close to 6,000, so it is reasonable.

Try It TogetherWe do

A store had 4,200 pens and sold 1,675. How many are left?

This is subtraction: 4,200 - 1,675. Regroup and subtract to get 2,525. So 2,525 pens are left.

Now YouYou do

A trip is 1,250 miles one way. How many miles is the round trip?

A round trip goes there and back, so add the distance twice. Check your answer in the back.

Practice

Mastered 0 of 11

Warm-up

Ease in with the basics.

  1. 1.Find 34 + 25.

  2. 2.Find 80 - 45.

  3. 3.Find 120 + 60.

On Level

The core Quick Check from the book.

  1. 1.Find 5,608 + 2,394.

  2. 2.Find 8,000 - 3,265.

  3. 3.Estimate 6,120 + 3,880 to the nearest thousand.

  4. 4.A team scored 2,450 points, then 1,675 more. How many in all?

  5. 5.Find 12,500 - 9,750.

Challenge

Stretch your thinking.

  1. 1.Find 45,608 + 37,955.

  2. 2.Find 60,000 - 24,375.

  3. 3.A theater sold 3,450 tickets Friday and 2,875 Saturday, then gave 500 refunds. How many tickets were kept?