Page 149 - NUMINO TG_2A

Activity 2

2. Have students write number sentences for 2 Use the number line to find the missing number.
the following problems using a box to
represent the missing number. Have them 18- 11 =7
use subtraction sentences to find the missing
numbers. 18

05 10 15 20
7
Finding the missing number in 18 7

Start at 18 on the number line. So, the missing number is 11 .

Find 7 on the number line and stop.

Count from 18 to 7.

The number of counted spaces is the 14

missing number. a 14- 6 =8

(If the arrow indicates right, it means , 05 10 15

and if it indicates left, it means .) 8

Finding the missing number in 12 32 b 39- 27 =12 39
Mark on the number line with a dot.
32 remains after 12 spaces are counted 12
back from .

Therefore, the sum of 32 and 12 is .

c 44 -12=32 32 12

82

Problem: Use the number line and make a sentence using .
22
36 24

Solution: Have students understand that an arrow to the right indicates addition and an arrow to the left
indicates subtraction.
22 24 36

Answer: 22 24 36

132 NUMINO Teacher s Guide