Page 45 - Maths Class 04

c. (12 × 24) × 36 = _______ × (24 × 36)

d. (781 × 9) × _______ = 781 × (9 × 819)

e. (347 × _______ ) × 8379 = 347 × ( 12 × 8379)

2. Use the distributive property to solve the multiplication problems.

a. 74 × 3 = 70 × 3 + 4 × 3 b. 62 × 5 = × + ×

210 + 12 = 222 + =

c. 57 × 7 = × + × d. 85 × 4 = × + ×

+ = + =

3. Solve.

a. 68 × 0 = ________ b. 891 × 1 = ________

c. 3119 × 1 = ________ d. 94 × 0 = ________

e. 0 × 816 = ________ f. 534 × 1 = ________
Carry On

5 × 5 = 25

35 × 35 = 1225

335 × 335 = 112225
3335 × 3335 = _________

33335 × 33335 = _________

Estimating the Products

When the exact answer is not needed, we estimate the products. Estimation

helps us to see if an answer is reasonable. When we estimate, we use numbers

close to the original numbers.

Example : Estimate the product of 48 and 33.

Solution : Estimated Product Actual Product

4 8
48 5 0 Rounding off × 3 3
33 × 3 0 numbers to 1 4 4
the nearest 10.
1 5 0 0
+ 1 4 4 0

The estimated product is close to the actual product. 1 5 8 4

Mathematics-4 45