SEAMO X 2022 — Paper A — Grade 1–2

Study the number patterns in the circles. Find $A$. Hint: find $C$ first.

Find $2+4+6+8+\cdots+38+40$.

Perimeter is the total boundary length. The example rectangle measures $6\text{ m}$ by $4\text{ m}$, perimeter $20\text{ m}$. Find the perimeter of the staircase figure below, width $10\text{ m}$ and height $8\text{ m}$.

Find $\overline{AA},\overline{BB},\overline{CC}$ in $\overline{AA}+\overline{BB}+\overline{CC}=\overline{ABC}$.

Mink drops a marble into the funnel. How many downward paths can it take?

At a party of twelve children, each boy receives three balloons and each girl five. Fifty balloons are given out. How many girls are there?

How many triangles are in the figure?

Study the table pattern. Find $r+c$.

How many beads are there in all four figures?

A March has four Thursdays and five Fridays. What weekday is the fifteenth? March has thirty-one days.

Using the balanced scales, how many ducklings balance one rabbit?

Compute $7+77+777+7777$.

A drawer has ten black, ten grey, ten red and four white socks. Without looking, what is the least number Rila must take to guarantee two pairs of the same colour?

Remy sits in a cabin on a circular observation wheel. There are nineteen cabins in front and nineteen behind. How many cabins are there?

Fill the seven circles with $1,2,3,4,5,6,7$, each once, so each three-number line sums to twelve. Find the middle circle.

Mink walks from $A$ to $B$ at $60\text{ m/min}$, while Nappon starts simultaneously from $B$ at $40\text{ m/min}$. They meet thirty metres from the midpoint. Find $AB$.

A teacher is short of two sweets if she gives each child three. Giving each child two leaves nine sweets. How many children?

Concatenate the square numbers $1,4,9,16,25,36,49,\ldots$. Find the twentieth digit.

Find the missing number in the circles.

A farm has twenty goats, ducks and chickens, with equal numbers of ducks and chickens. They have fifty-six legs in all. How many goats?