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

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

sushi88

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.

Amma12345

TYSM!

ChiefKiasu

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.

sushi88

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