Question

Practice Time
1. There are four very old cave-paintings. Mark the oldest.
(a) 4200 years old
(b) 1000 years old
(c) 8500 years old
(d) 1300 years old

2. One bus can carry 48 children. How many children can three buses carry? About —
(a) 100
(b) 200
(c) 150

3. Which pair of numbers add to make more than 500?
(a) 152 and 241
(b) 321 and 192
(c) 99 and 299
(d) 401 and 91

4. What happened at what time? Draw lines to match.

Answer 1

1) There are four very old cave paintings. The oldest painting is 8500 years old.

Hence, the correct option is (c).

2) Number of children in 1 bus = 48
Number of children in 3 buses = 48$\times$3 = 144
There are about 150 children.

Hence, the correct option is (c).

3) We will add the pairs to check the pair that has the sum greater than 500.

$\begin{array}{cccc}& 1& 5& 2\\ +& 2& 4& 1\\ & 3& 9& 3\end{array}$

$\begin{array}{cccc}& \overline{)1}& & \\ & 3& 2& 1\\ +& 1& 9& 2\\ & 5& 1& 3\end{array}$

$\begin{array}{cccc}& \overline{)1}& \overline{)1}& \\ & & 9& 9\\ +& 2& 9& 1\\ & 3& 9& 0\end{array}$

$\begin{array}{cccc}& & & \\ & 4& 0& 1\\ & +& 9& 1\\ & 4& 9& 2\end{array}$

We can see that 321 and 192 together make more than 500.

Hence, the correct option is (b).

4)