Digits, numbers and the decimal system
Answers are for parents and teachers.
1
Write the digits of 90314 from left to right and say how many digits the number has.
9, 0, 3, 1, 4: five digits.
2
Write 6070 in expanded form.
6×1000 + 0×100 + 7×10 + 0×1 = 6000 + 0 + 70 + 0.
3
What is each 4 worth in 4480?
The first 4 is in the thousands place and is worth 4000; the second 4 is in the hundreds place and is worth 400.
4
Which number is 8×10³ + 5×10¹ + 2×10⁰?
8052. There is no hundreds term, so a 0 is the placeholder there.
5
A number system has base 5. Write its symbols and its first four place values, then write the decimal number 91 with its base.
Symbols 0, 1, 2, 3 and 4; place values 1, 5, 25, 125; (91)₁₀.