Page 30 - NUMINO TG_3A

01About 1,000 Unit

Material Mirror
CMath Vo abulary symmetry: a shape that completely overlaps when folded in half

1 . Use a mirror and find all the 4-digit mirror numbers. Mirror 1. Have students write numbers on a piece of
paper or use number cards to make numbers
What you need: and find mirror numbers. Have them place a
mirror in the middle of the numbers. Give
1001 1111 them enough time. Have students work
individually or with a partner or a team (so
they can discuss with each other).

Remind students not to use a zero in the
thousands place; 0880, 0110. Remind them
to use a comma after the thousands when
writing a number.

8888 1881

8118 8008

How many 4-digit mirror numbers are there?

There are six 4-digit mirror numbers: 1001, 1111, 8888, 1881, 8118, and 8008.

1. About 1,000 11

Indian and Arabic Number System
You can use ten numerical symbols (0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ) to express all numbers. The fundamental
principle of this system is that you can group numbers in tens. If you have 10 ones, the value of the number
is 10. If you have ten tens, the value of the number is 100. If you have 10 hundreds, the value of the number
is 1,000. You can use this system to find the true value of a digit in a number.

3A Unit 01 013