Rounding on a number line

Grade 3 · Number sense and place value

Drag a marker to place a number on a number line, then tap the end it rounds to. The line runs between the two tens (or hundreds) either side of the number.

Some numbers land exactly halfway, like 435 or 450, and round up: the case children most often get wrong.

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What changes each time

• Rounding to the nearest 10 or the nearest 100
• Numbers from 11 to 989
• About one in seven lands exactly halfway

More number sense and place value practice

• Tens and ones (Grade 1)
• Comparing numbers (<, = and >) (Grade 1)
• Hundreds, tens and ones (Grade 2)
• Odd and even numbers (Grade 2)
• Writing numbers in digits (Grade 3)
• Place value (Grade 3)
• Smallest and largest numbers (Grade 3)
• Making numbers with 1, 2, 4 and 8 (Grade 3)
• Negative numbers on a number line (Grade 4)
• Halfway between two numbers (Grade 4)
• Nth largest and smallest numbers (Grade 5)

All practice topics