Page 49 - Maths Class 04

4. Class 5 is visiting the local cafe. There are 29 children and each of them

orders a hot chocolate costing ` 90. How much money does class 5 spend ?

5. We need new footballs! A box contains 12 footballs and we buy 15 such
boxes. How many footballs do we buy ?

6. Eighteen aliens landed on the playing fields! Each alien had 3 laser guns! How

many laser guns did they have altogether ?

7. Class 5 has run out of whiteboard pens! Miss Evan orders 8 boxes and each
box contains 18 pens. How many pens will she has ?

Carry On

Fill in the blanks.

1. (_______ × 581) × 497 = 844 × (581 × 497)

2. 42 × (75 × 71) = (42 × 75) × _________

3. 3192 × ________ = 8697 × 3192

4. ________ × 93 = 93 × 47
5. 669 × _________ = 669

6. 542 × _________ = 0

7. 217 × (981 + 39) = (217 × 981) + (217 × _______ )

Lattice Multiplication

While using a lattice of squares, the numbers to be multiplied (factors) are

written outside the lattice and the products are written inside after drawing

the diagonals of the squares. Let us study about the method.

Example : Multiply 38 by 47.

Solution : Step 1: Draw the lattice of 4 squares and the diagonal as shown :

Mathematics-4 49