SEAMO X 2023 — Paper A — Grade 1–2

Find the missing number in the diagram.

A farmer has fifteen chickens and rabbits with forty-eight legs altogether. How many rabbits?

Find the perimeter in centimetres of the notched figure.

Evaluate $1+2+3+\cdots+48+49+50$.

Find the shaded area in square centimetres.

Find $8+88+888+8888$.

A number greater than thirty and less than fifty leaves remainder one on division by four and remainder two on division by seven. Find it.

A teacher gives each student four sweets and has eleven left. Giving each five would require one more sweet. How many sweets does she have?

A magic square contains $1$ through $9$, each once; every row, column and diagonal has the same sum. Find the question-mark cell.

Square numbers are $1^2=1,2^2=4,3^2=9,4^2=16,\ldots$. Find the thirtieth digit in their concatenation $14916253649\ldots$.

The three-digit number $\overline{4ab}$ is divisible by $91$. Find it.

January first was Wednesday. What weekday was February fourteenth of that same year?

Mr Wattana leaves $A$ for $B$ at $10{:}00$, at $90\text{ km/h}$. One hour later Mink leaves $A$ for $B$ at $120\text{ km/h}$. At what time, in twenty-four-hour format, does she catch him?

Evaluate $1+2-3-4+5+6-7-8+\cdots+93+94$.

Find the number of shortest paths from $A$ to $B$.

Find the four-digit number $\overline{abcd}$ such that $9\overline{abcd}=\overline{dcba}$.

Cindy is two years older than her brother. Their ages have product ninety-nine. How old is Cindy?

Lily pads double their covered area every day. The whole pond is covered on day eighteen. On what day was half covered?

Find the missing number: $3,3,6,9,15,24,\square$.

Given $1\otimes3=10$, $2\otimes4=20$, $6\otimes5=61$, find $7\otimes2$.