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Math City Challenge

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About this activity

A quick number quest across basic math ideas.

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Indonesia

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Math City Challenge
 

Math City ChallengeOnline version

A quick number quest across basic math ideas.

by Muhammad Thoifus Salim
1

I am the tens digit of 47.

Hints

The tens place tells us how many tens there are.

In 47, the rightmost digit is 7.

Look at the second digit from the right.

2

Which number is bigger: 128 or 1028?

Hints

1028 has four digits while 128 has three.

Compare from the leftmost digit.

Count the digits: more digits usually means a larger number.

3

Add 36 and 27.

Hints

Remember units go in the ones place.

Add the tens with the carry: 3 + 2 + 1 = 6.

Add the ones: 6 + 7 = 13, write 3 carry 1.

4

Subtract 59 from 150.

Hints

Complete the subtraction to get the difference.

Borrow from the tens, then from the hundreds as needed.

Subtract the ones: 0 - 9 you borrow.

5

What is 3 times 7?

Hints

Product is the total after grouping.

Think of 7 plus 7 plus 7.

Repeated addition: 7 added 3 times.

6

Divide 24 by 3.

Hints

Distribute 24 into three equal parts.

25 minus 1 doesn’t help here; use equal groups.

How many groups of 3 are in 24?

7

What is one-third of a cake?

Hints

One of those pieces is 1/3 of the cake.

Divide the cake into three equal pieces.

Fractions show parts of a whole.

8

Which is bigger: 1/3 or 1/4?

Hints

1/3 has a larger piece than 1/4.

In fractions with the same numerator, the smaller denominator is bigger.

Same-sized wholes are divided into equal parts.

9

What is the value of the hundreds digit in 345?

Hints

345 = 3 hundreds + 4 tens + 5 ones.

The leftmost digit in 345 is the hundreds digit.

Place value tells you how many hundreds are present.

10

I am a two-digit number with 4 tens and 3 ones.

Hints

The ones digit is 3.

The tens place is the first digit here.

Tens digit represents groups of ten.

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