Topic 1 of 8 · Grade 7
Number and place value
Every digit in a number has a value that depends on its place.
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Every digit in a number has a value that depends on its place.
Place value
Millions | Hundred thousands | Ten thousands | Thousands | Hundreds | Tens | Ones.
In 4 703 251, the digit 7 stands for 700 000 (seven hundred thousand).
Reading and writing numbers
2 050 408 is written in words as "two million, fifty thousand, four hundred and eight".
Ordering and comparing
Compare digits from the left until two digits are different. 345 210 is greater than 345 120 because the first different digit is in the hundreds place, and 2 hundreds is more than 1 hundred.
Rounding
Look at the digit to the right of the place you are rounding to: 5 or more – round up; less than 5 – round down.
Worked example: Round 68 452 to the nearest thousand.
The hundreds digit is 4 (less than 5), so 68 452 → 68 000
Roman numerals
I = 1, V = 5, X = 10, L = 50, C = 100. XIV = 14; XL = 40.
Check yourself
- What is the value of 6 in 3 162 980?
- Round 7 856 to the nearest hundred.
- Write 29 in Roman numerals.
Show answers
- 60 000 (sixty thousand)
- 7 900
- XXIX
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