SEAMO 2021 — Paper A — Grade 1–2

Question 1

Find $11+12+13+\cdots+17+18+19$.

$120$
$125$
$130$
$135$
$140$

Question 2

Find the number of cubes in the figure, including hidden supporting cubes.

Question illustration

$12$
$13$
$14$
$15$
$16$

Question 3

Find the missing numbers $m,n$.

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$7,8$
$8,9$
$8,8$
$7,9$
$10,3$

Question 4

Grandpa is $56$, Dad is $31$, and I am $7$. In how many years will our ages sum to $100$?

Question 5

Find the missing number: $2,2,4,6,10,16,\square,42$.

$24$
$25$
$26$
$28$
$30$

Question 6

Which figure comes next in the last row?

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Option A
Option B
Option C
Option D
Option E

Question 7

Wattaria places coins on the three sides of a triangle so each side contains $6$ coins. How many coins are there in total?

Question illustration

$15$
$16$
$17$
$18$
$19$

Question 8

At a party there are $18$ children. Each girl receives $5$ balloons and each boy $3$. Altogether $72$ balloons are distributed. How many boys are there?

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$6$
$7$
$8$
$9$
$10$

Question 9

Fill the four empty circles with $2,5,6,7$ so each triangle side has sum $18$. Find $x$.

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$2$
$5$
$6$
$7$
None of the above

Question 10

Postman Pat moves from A to B only right or up along the grid. How many different paths can he take?

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$33$
$34$
$35$
$36$
$40$

Question 11

How many triangles are in the figure?

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$14$
$15$
$16$
$17$
$18$

Question 12

Susan adds eight of the nine numbers shown and gets $400$. Which number did she leave out?

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$75$
$16$
$64$
$78$
$29$

Question 13

Today is Monday, $9$ August. What weekday is $9$ September?

Tuesday
Wednesday
Thursday
Friday
Saturday

Question 14

Lily writes the integers $1,2,3,\ldots,78,79$. How many digits does she write altogether?

$130$
$132$
$140$
$145$
$149$

Question 15

Find the missing number under the nested shapes.

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$42$
$32$
$31$
$24$
$14$

Perimeter is the total length of a shape’s outline. The sample $5\text{ cm}$ by $3\text{ cm}$ rectangle has perimeter $5\times2+3\times2=16\text{ cm}$. Find the perimeter of the staircase figure.

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$21\text{ cm}$
$22\text{ cm}$
$24\text{ cm}$
$26\text{ cm}$
$28\text{ cm}$

Question 17

Find the sum of the first $42$ terms of $2,4,6,2,4,6,\ldots$.

$168$
$164$
$162$
$160$
$172$

Question 18

What time comes next in the clocks?

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$11{:}45\text{ am}$
$11{:}50\text{ am}$
$10{:}50\text{ am}$
$11{:}00\text{ am}$
$10{:}55\text{ am}$

Question 19

Mum gives Mink some money. Mink spends $5$ dollars on a book, receives $10$ from Dad, then spends $2.50$ on a drink and $1.70$ on fries. She has $23.80$ left. How much did Mum give her?

$21.80$
$22.00$
$22.50$
$22.80$
$23.00$

Question 20

The digits $R,I,C,E$ are all odd. Given $E+\overline{CE}+\overline{ICE}+\overline{RICE}=\overline{GGGG}$, find $C$.