COMS Tutorial Corner

Sample Review Quiz for Grade 3 /4

Question 1. Find the sum by calculation (Multiple-digit addition; with “carry”)

Add1-vtAdd2-vt

Please answer the following questions too.

(a) Look at the sum that you find. What are the digits at odd places (units-digit, and hundreds-digit)? What is the sum of digits at odd places?

(b) Look at the sum that you find. What are the digits at even places (tens-digit, and thousands-digit)?
What is the sum of digits at even places?

Question 2. Knowing how to look at the clock.clocknull

(a) Draw a clock for 9:10.
What is the time 2 hours later?

(b) Draw a clock for 11:35.
What is the time 1/2 hour later? (or 30 minutes later)

Question 3. Complete the Pattern by filling in the blanks.
Let us consider some lists of natural numbers (integer sequences). In these lists, we can find any number by adding or subtracting a fixed number (except 1st number). We will describe of adding /subtracting a fixed number as the rule . An example is provided below.

48, 45, 42, _39_, _36_, _33_
Rule: -3

-3 indicates that we always subtract 3 to get the next number.
To describe adding a fixed number, using “+” sign followed by the fixed number to add.

Please follow the example above to complete:

(a) 59, 63, 67, ___, ___, ___
Rule: ____

(b) 49, 43, 37, ___, ___, ___
Rule: ____

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