50
Comparing three-digit numbers
Textbook: Part 2, lesson 48, pp. 16–17
GoalCompare a three-digit number with a two-digit or one-digit number.
New words
digit · raqamtwo-digit number · ikki xonali sonone-digit number · bir xonali sonconclusion · xulosa
Explanation
A three-digit number has three digits, a two-digit number has two, a one-digit number has one. Any three-digit number is greater than any two-digit or one-digit number. For example, 301 > 9 and 100 > 99. If the numbers have the same count of digits, compare place by place as usual: 450 > 405.
Worked examples
34 and 170: 34 has two digits, 170 has three. 34 < 170.
89 and 103: 89 < 103 because 103 is a three-digit number.
Class activity
“Number line-up”: three children hold cards with a three-digit, a two-digit and a one-digit number. They line up from smallest to greatest and explain why.
Practice
1
Compare: 34 and 170.
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2
Compare: 450 and 405.
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3
Compare: 301 and 9.
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4
If a = 100, compare a and a + 290.
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