Decimals & Percents · Understand decimals · 1.4

Round decimals.

To round, look at the digit just after your place: 5 or more rounds up, less than 5 rounds down. 3.456 to the nearest hundredth is 3.46 (the next digit, 6, rounds up).

01 / THE IDEA

See it work.

Watch the method

Round decimals

3.456 → nearest hundredth → 3.46.

1 / 2
3.4563.456
1

Look at the next digit

The digit after the hundredth place is 6 — round up.

3.4563.456
2

Round

Rounded to the nearest hundredth.

≈3.46\approx 3.46
02 / YOUR TURN

Practice until it feels automatic.

Your turn

Work it out.

Type a decimal, e.g. 0.75.

streak 0
best 0
… =
— / WHY IT WORKS

The idea underneath.

The next digit decides

Find your rounding place, look one digit to the right; ≥5 rounds up, <5 leaves it. Drop the rest.

Why it works

3.456 → the 6 pushes the 5 up to 6.

03 / WORKED EXAMPLES

From easy to tricky.

EX 1easy

Round 3.012 to the nearest tenth.

1

Look at the next digit

The digit after the tenth place is 1 — round down. 3.012

2

Round

Rounded to the nearest tenth. ≈ 3.0

EX 2medium

Round 1.214 to the nearest tenth.

1

Look at the next digit

The digit after the tenth place is 1 — round down. 1.214

2

Round

Rounded to the nearest tenth. ≈ 1.2

EX 3hard

Round 9.721 to the nearest tenth.

1

Look at the next digit

The digit after the tenth place is 2 — round down. 9.721

2

Round

Rounded to the nearest tenth. ≈ 9.7

04 / COMMON TRAPS

Where students slip.

Trap

Rounding using a digit two places over.

Fix

Only the very next digit decides.

Trap

Forgetting to drop the trailing digits.

Fix

Keep only up to the rounding place.

05 / QUIZ

Test yourself.

The Test

12 problems across three tiers. Auto-graded on submit. Hints and a full walkthrough on every question. Your work is saved on this device — sign in to keep it across devices.

0/12Answered
How to answerType just the value. Formatting won't trip you up — we ignore spaces, capital letters, commas, and subscript style, so t₁ = 5, d = 3 and t1=5,d=3 both count. For a list of numbers, separate them with commas (e.g. 3, 10, 17).
Core

Core (4)

C1

Round 5.597 to the nearest tenth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
C2

Round 3.828 to the nearest tenth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
C3

Round 3.122 to the nearest tenth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
C4

Round 6.047 to the nearest hundredth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
Apply

Apply (4)

A1

Round 7.618 to the nearest tenth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
A2

Round 3.042 to the nearest tenth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
A3

Round 7.395 to the nearest tenth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
A4

Round 9.651 to the nearest hundredth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
Extension

Extension (4)

E1

Round 9.015 to the nearest hundredth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
E2

Round 4.976 to the nearest tenth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
E3

Round 4.053 to the nearest hundredth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.
E4

Round 1.173 to the nearest hundredth.

Need a hint?
  • Look one digit past your place.
  • 5 or more rounds up.