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Let’s Start! Maths 1, Workbook Let’s Start! Maths 1, Workbook

Let’s Start! Maths 1, Workbook
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Let’s Start! Maths 1, Teacher’s Book
4 Numbers 11 to 20 Numbers 11 to 20 4

Activity 3 • Explain to Ss that all teen numbers are ten Activity 4 Compare numbers up to 20
and some more.
a. A group of 10 apples should be circled. • Focus Ss’ attention on the table in this a. 17 = 1 ten and 7 ones • Draw Ss’ attention to the theory section.
10 and 6 make 16. b. 14 = 1 ten and 4 ones • Draw Ss’ attention to the picture.
section.
b. A group of 10 cubes should be circled. • Explain to Ss that we call this a place value c. 19 = 1 ten and 9 ones • Have Ss count the red and the green
10 and 9 make 19. table. We use this table to write a number apples.
c. A group of 10 bottles should be circled. in tens and ones. • Explain to Ss that there are 13 red apples in
10 and 7 make 17. • Ask Ss How many tens and ones does Activity 5 set A and 15 green apples in set B.
number 15 have?
number 15 have? (Number 15 has 1 ten and
number 15 ha v e ? (Number 15 has 1 t en and a. 10 and 1 is 11. • Write ‘13’ and ‘15’ on the board.
Place value 5 ones.). b. 10 and 6 is 16. • Explain to Ss that to compare these
• Allow Ss some time to think about their c. 10 and 2 is 12. numbers, irst we compare the tens.
• Draw Ss’ attention to the theory section. answers. • Point out to Ss that both numbers have 1
• Draw Ss’ attention to the picture. Activity 6 ten, so we have to compare the ones.
• Explain to Ss that we can see a group of 10 • Explain to Ss that 15 is greater than 13 or 15
dolls and 3 more dolls. We know that 10 a. Tens Ones is more than 13, because 5 is greater than 3.
Ones
ens
T
and 3 make 13. • Write ‘15 > 13’ on the board.
• Explain to Ss that we call each object one 1 8 • Explain to Ss that we can also say that 13 is
and each group of ten objects a ten.
smaller than 15 or that 13 is less than 15.
• Write ‘10 + 3 = 13’ on the board. • Write ‘13 < 15’ on the board.
• Explain to Ss that number 10 is the same as Which is more , 16 or 12 ? Why ? ?
, 16 or 12
Which is more
? Why
16 is
(
1 ten and 3 is the same as 3 ones, so 13 is 1 b. • Ask Ss Which is more, 16 or 12? Why? (16 is
more than 12 as both numbers have 1 ten
ens
Ones
ten and 3 ones. T Tens Ones but 6 is greater than 2.).
• Point out to Ss that we call the numbers
from 11 to 19 teen numbers. 1 2 • Allow Ss some time to think about their
answers.
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