3
Review: length, weight and time
Learner’s Book 1: Units 12–15, pp. 166–229
GoalMeasure with a ruler, compare weights and read times, days and months.
New words
centimetre (cm) · a small unit for measuring lengthheavier · has more mass, pushes the balance downhalf past · the long hand points to 6
Explanation
To measure a length, put the start of the line at 0 on the ruler. Read the number at the end of the line. That number is the length in centimetres. On a balance, the heavier thing goes down. A jug holds more than a cup, so its capacity is bigger. A clock shows o’clock and half past times. Days and months always come in the same order, so we can count on to find tomorrow or next month.
Worked examples
The crayon starts at 0 and ends at 4. It is 4 cm long.
The pan with the melon is lower, so the melon is heavier than the grapes. The grapes are lighter.
The long hand is on 6 and the short hand is halfway between 3 and 4. It is half past 3.
Class activity
Home measuring: use a ruler to measure 3 things (a spoon, a book, a toy). Then put a book and a toy on a home-made balance (a ruler on a pencil) to find which is heavier. Say the time on the kitchen clock at lunch and at supper.
Practice
1
How long is the line?
9 cm
2
Which is heavier, the pencil or the book?
the book (its pan is lower)
3
What time is it?
half past 7
4
Tomorrow is Sunday. What day is today?
Saturday