Maths Quiz Winners: April

International Friendship Day Activity, 2010

Here are the contributions from the pupils of Class 3A:

International Friendship Day Activity, 2010

On Friday 16th April 2010, we are celebrating International Friendship Day. Share your experience with the class. It can be something interesting you know about another country or an overseas trip you have made. It can be your thoughts about International Friendship Day, the people, the arts, the culture, the food, the sports or a special place you have visited. If you use a photograph or picture that is not your own, do remember to cite the source.

Here's something from me:



You may also retrieve the softcopy of the activity sheet from our school portal and submit you assignment online. Instructions are available under class announcement.

Mathematical Blogging 3

Topic: Multiplication and Division

Question L:

Wendy has 24 sweets. She shares them equally with her sister.
Wendy then eats 5 sweets from her share. How many sweets does Wendy have now?

Amy’s solution: 24 – 5 = 19
Wendy has 19 sweets left.
There is something wrong with Amy’s solution.

1. Explain the mistake in Amy’s solution.
2. Show how you would find the answer to the problem.

Question M:

In a class there are 17 girls and 18 boys.
Each pupil has 5 storybooks.
The teacher wants to know how many storybooks the children have altogether.

Ben’s solution: 17 x 5 = 85
85 + 18 = 103
The children have 103 storybooks altogether.

There is something wrong with Ben’s solution.
1. Explain the mistake in Ben’s solution.
2. Show how you would find the answer to the problem.

Question H:

Henry has 840 picture cards. He gave 70 cards to his brother.
The remaining cards are shared equally among 7 of his friends.
How many picture cards did each friend receive?

Tony’s solution: 840 ÷ 7 = 120
120 - 70 = 50
Each friend receives 50 picture cards.

There is something wrong with Tony’s solution.
1. Explain the mistake in Tony’s solution.
2. Show how you would find the answer to the problem.

Mathematical Blogging 2

Topic: Addition and Subtraction

Question L:

Fred spent $4357 on a tour. Tim spent $230 more than Fred.
How much did Tim spend on the tour?

Amy’s solution: 4357 - 230 = 4127
Tim spent $4127.
There is something wrong with Amy’s solution.

1. Explain the mistake in Amy’s solution.
2. Show how you would find the answer to the problem.

Question M:

The mass of a lion is 180kg.
A cow is 36kg lighter than the lion.
Find the total mass of the two animals.

Ben’s solution: 180 + 36 = 216
The two animals have a mass of 216 kg.

There is something wrong with Ben’s solution.
1. Explain the mistake in Ben’s solution.Show how you would find the answer to the problem.

Question H:

Mary has 60 ice-cream sticks. Ted has 150 more ice-cream sticks than Mary.
Samy has 50 fewer ice-cream sticks than Ted.
How many ice-cream sticks do they have altogether?

Tony’s solution: 60 + 150 = 210
210 - 50 = 160

210 +160 = 370
They have 370 ice-cream sticks altogether.

There is something wrong with Tony’s solution.
1. Explain the mistake in Tony’s solution.
2. Show how you would find the answer to the problem.

Science Centre Visit April 5th, 2010

Science Centre Visit: Hissing Cockroach

What is a hissing cockroach? Under which group of animals would you classify a hissing cockroach? What are the white creatures on its back?

Mathematical Blogging 1

Topic: Multiplication of 6, 7, 8 and 9

Question L:

Billy wrote this in his book.

5 x 6 = 30
So, 7 x 6 = 30 + 6
= 36

Explain the mistake in Billy’s solution and obtain the correct answer.


Question M:

Billy wrote this in his book.

10 x 6 = 60
So, 9 x 6 = 60 + 6
= 66

Explain the mistake in Billy’s solution and obtain the correct answer.


Question H:

Without using vertical multiplication,
how would you solve 22 x 6 if you are given 10 x 6 =60?