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Question

Hi, could I please have help with this question?

 

A game booth has 3 point, 5 point and 10 point targets. Bobby hit 12 targets and scored 62 points altogether. How many 3 point targets did he hit?

 

 

Source: homework

Answer

Assuming the child knows multiplication,

62  => the 2 points would have come from the 3 points, since multiples of 5 and 10 cannot achieve 2.

3 point x 4 = 12 

Hence,  he hit 4 3-point target.

Check:  4 are 3-points => remainder  of targets = 8   and remainder for points = 62-12 = 50

6 x 5 = 30

2 x 10 = 20

Total = 50 points and targets = 8

***********************************

Alternatively, guess and check method:

No of targets            3 point           5 point             10point          Sum of 5 -point and 10 point possible?


           1                        3                      <——  59 ———–>            59 cannot be a sum of 5s and 10s

           2                 3+3=6                     <——-56 ———–>               No

           3               3+3+3=9                  <——-53 ———–>                  No

           4               3+3+3+3=12            <——-50 ———–>                 Yes

Hence,  he hit 4 3-point target.

 

Note:  The child has to understand that addition of 5s and 10s can only end with numbers with 5 or 0 in the last digit for the guess and check up there.

1 Reply 1 Like ✔Accepted Answer

TYSM!

1 Reply 0 Likes

My goodness.  The questions they are giving to primary 1 students are ridiculous.  During my time, primary 1 kids are still learning their times tables… lol.

1 Reply 0 Likes

I agree, it’s a bit shocking for it to be a P1 question.  I thought I saw wrongly when I was solving it.  

0 Replies 1 Like
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