3. Complete the following. Estimate your answer first and then use a calculator to check your answer.


a) H T U 287


× 9


b) H T U 471


× 6


c) H T U 549


× 4


d) H T U 346


× 2


e) H T U 674


× 2


f) H T U 398


× 8


g) H T U 741


× 3


h) H T U 409


× 7


4. Complete the following in your copy. Estimate your answer first and then check your answer using a calculator.


a) 208 × 9 f) 462 × 4


Skittles Crazy


Irish skittles is an ancient game that was often played at the crossroads in Irish towns. It is an easy game to play and can be played by 2 people or by any number of teams. Skittle competitions still take place all over the country today.


5. Seven schools tool part in a skittles competition during the school year. They received 6 points for a win. Work out the total points for each team in the grid below.


St Brigid’s Games won 15


Total points (6 per win)


Multiplying Bigger Numbers 6.


a) 5 × 10 = e) 66 × 10 = i) 829 × 10 =


Multiplying in Tens Example 1:


6 × 20 = (6 × 10) × 2 6 × 20 = 60 × 2 = 120


84 Multiplication 2


b) 82 × 10 = f) 99 × 10 = j) 909 × 10 =


c) 17 × 10 = g) 123 × 10 = k) 500 × 10 =


d) 41 × 10 = h) 453 × 10 = l) 111 × 10 =


St


Benedict’s 23


St


Mary’s 21


San Carlo


11


Scoil Eoin


10


Scoil Mhuire


17 St


Patrick’s 24


b) 612 × 3 g) 382 × 3


c) 735 × 2 h) 109 × 9


d) 136 × 7 i) 235 × 5


e) 312 × 3 j) 486 × 2


Example 2:


3 × 40 = (3 × 10) × 4 3 × 40 = 30 × 4 =


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