TGrade 2 Issue 6-2005 Mathematics Magazine

Mathematics Magazine for Grades 1-12

Theory:

Decimals

Decimals are a method of writing fractional numbers without writing a fraction having a numerator and denominator.

The fraction 37/100 could be written as the decimal 0.37. The period or decimal point indicates that this is a decimal.

The decimal 0.37 could be pronounced as THIRTY-SEVEN HUNDREDTHS or as ZERO POINT THREE SEVEN or ZERO POINT THIRTY-SEVEN.

Solutions from the Previous Issue:

1. Mary wants a new yellow dress. She wants new white shoes. She wants yellow and white ribbons for her hair. Her mother took her to the store. They spent $64.00. The yellow and white ribbons cost $6.00. The white shoes cost $23.00. How much did the dress cost?

Solution: The dress cost:

$64.00 - $23.00 - $6.00 = $35

2. Willy can't be still. When he goes to school he wiggles. When he goes to see a movie, he wiggles. When he is at home he wiggle. Everywhere he is, Willy wiggles. Today his teacher counted his wiggles at school - one hundred eight wiggles! His friend counted his wiggles at the movie - forty-seven wiggles! His mother counted his wiggles at home - two hundred four wiggles! How many times did Willy wiggle today?

Solution: 108 + 47+ 204 = 359

Willy wiggled 359 times today.

3. Stephanie watched the ducks on the pond for an hour. She counted five ducks on the pond. Then twelve more ducks came to the pond. Two ducks flew away. Three more ducks came to the pond and seven flew away. How many ducks were left on the pond?

Solution: 5 ducks + 12 ducks – 2 ducks + 3 ducks – 7 ducks = 11 ducks

There were 11 ducks left on the pond.

4. Today is the first day of spring. The sun is shining. The birds are singing. Aaron looked out his bedroom window. There were eleven bluebirds in the apple trees. There were nine blue jays in the pear tree. There were two cardinals at the bird feeder. There were fourteen finches picking up seeds under the bird feeder. Oh, how loud all the birds were! How many birds did Aaron see in all?

Solution: 11 birds + 9 birds + 2 birds + 14 birds = 36 birds

Aaron sees 36 birds in all?

Proposed Exercises:

Alexandru Rosu St.John Bosco School, Grade 2 BRAMTON, ONTARIO, CANADA

1. 2 5 + 7 6 - 1 =