## Math Kangaroo Comes to Baltimore

For the first time in Baltimore, TNCS hosted Math Kangaroo, an International Competition for 1st- through 12-grade students whose mission is to:

- Encourage students to master their mathematical knowledge.
- Give them confidence in their ability for comprehending mathematics.
- Help them understand how mathematics applies in nature’s laws and human activities.
- Develop their ability to derive pleasure and satisfaction through intellectual life.
- Show that mathematical education is significant in every part of the world.

“Bringing an international math competition to Baltimore has been a dream of mine for a long time,” said TNCS Co-Founder/Co-Executive Director and former math teacher Jennifer Lawner.

A challenge for Baltimore as more people are choosing to stay and raise their families here is offering appropriate activities for them that are currently available in the county. Organizations like the Downtown Baltimore Family Alliance and Coppermine Fieldhouse have been critical in trying to recruit activities for Baltimore so that we can have our children participate in engaging pursuits and sports leagues, and I think TNCS also helps with extracurricular activities. For me, math competitions are also in the realm of things that Baltimore needs to function as a livable place for families.

## Why Math Kangaroo

The biggest appeal of Math Kangaroo, however, is the approach to doing math. For example, the problems start easy and get progressively harder so that there will always be enough problems for the individual student to be able to work out and feel successful enough to keep going. “Encountering problems they have never been exposed to before is a really good experience for students,” added Ms. Lawner, “because they have mastered at least enough skills to try, and that’s our primary goal for them—to be motivated to *try *but be okay with possibly not being able to get it the first time.” TNCS’s regular math curriculum consists of skill-building and problem-solving, but Math Kangaroo provided a fresh kind of problem for students to tackle. Said Ms. Lawner:

The problems are formulated in such a way that, for example, multiplication might be necessary for the solution, but it won’t be immediately obvious that multiplication is required. The student has to fundamentally understand what multiplication accomplishes in order to use it in the context of the problem. It’s not just working through 50 arithmetic problems in a fixed amount of time, as people might imagine. These problems might involve multiple steps, each requiring a mathematical tool that the students have been learning to use, which gets them figuring out how these skills fit into solving the problem. It’s not a repetitive thing; with actual problem-solving, you have to use logicin addition totraditional math skills. The strength of these problems is that they must be understood very deeply to be solved, and that’s really what is being tested.

## Math Kangaroo 2015 Sample Questions

### Level 1/2

1. Look closely at these four pictures.

Which figure is missing from one of the pictures?

### Level 3/4

2. Peter has ten balls, numbered from 0 to 9. He gave four of the balls to George and three to Ann. Then each of the three friends multiplied the numbers on their balls. As the result, Peter got 0, George got 72, and Ann got 90. What is the sum of the numbers on the balls that Peter kept for himself?

A) 11 B) 12 C) 13 D) 14 E) 15

### Level 5/6

3. Four points lie on a line. The distances between them are, in increasing order: 2, 3, k, 11, 12, 14. What is the value of k?

A) 5 B) 6 C) 7 D) 8 E) 9

### Level 7/8

4. In a group of kangaroos, the two lightest kangaroos weigh 25% of the total weight of the group. The three heaviest kangaroos weigh 60% of the total weight. How many kangaroos are in the group?

A) 6 B) 7 C) 8 D) 15 E) 20

### Level 9/10

5. The figure shows seven regions formed by three intersecting circles. A number is written in each region. It is known that the number in any region is equal to the sum of the numbers in all neighboring regions. (We call two regions neighboring if their boundaries have more than one common point.) Two of the numbers are known (see the figure). Which number is written in the central region?

A) 0 B) – 3 C) 3 D) – 6 E) 6

### Level 11/12

6. When reading the following statements from the left to the right, what is the first statement that is true?

A) C) is true. B) A) is true. C) E) is false. D) B) is false. E) 1 + 1 = 2

## Competition Outcomes

*enjoyed*it, more importantly, which was the primary goal. It’s easy to speculate on why—it’s a competition—a

*game*—not an anxiety-inducing test, and kids brought lots of positivity to the experience. The challenge is itself motivating, in the same way sports can be for the physical body. Participation, moreover, is optional.

*joie de math*. Another reason, explained Ms. Lawner, “is that children all over the world were participating, so our students felt very special to be a part of this. Mathematics is done all over the world, and Math Kangaroo wants to make students aware of that connection and prepare them for that global challenge.”

## The Future of Math Kangaroo at TNCS

There’s so much talent in Baltimore, in our children, and I would just love for them to be encouraged to come show their stuff. Sometimes all children need is to be asked to participate. It might start somebody down a path that could lead to his or her life’s passion. I think it’s really important to encourage math, especially as students get older and the math gets harder. Our goal here is for students to get a really solid foundation in math so that later they’re able to make choices and that multiple future paths are open to them. A career in engineering, for example, requires a certain level of math skill. So, we always want to promote the possibility that you can do it—you can stare at a problem long enough, given the right tools, to find a creative solution.

**Answers to Practice Questions**

**1.**D)

**2.**E) 15

**3.**E) 9

**4.**A) 6

**5.**A) 0

**6.**D) B) is false.