EN हिं

NCERT Solutions for Class 5th Maths Chapter 9 Solve the multiplication problem, then write two division statements — Let Us Do

Book page 120 Updated on2026-09-19

Q1.
1. Solve the following multiplication problems. Write two division statements in each case. 30 × 30 = ________
Answer

30 × 30 = 900.  Division statements: 900 ÷ 30 = 30 (and again 900 ÷ 30 = 30).

  1. Use the fact you already know. 3 × 3 = 9.
  2. Count the zeros. There is one zero in each 30 — two zeros in all.
  3. Put them back. 9 with two zeros is 900. So 30 × 30 = 900.
  4. Turn it around. N = D × Q means 900 = 30 × 30, so 900 ÷ 30 = 30.
30 × 30 = 900
900 ÷ 30 = 30
900 ÷ 30 = 30
Something special here: Both circle numbers are the same, so the two division statements come out the same as well. That only happens when a number is multiplied by itself.
Q2.
400 × 8 = ________ , and the two division statements.
Answer

400 × 8 = 3200.  Division statements: 3200 ÷ 8 = 400 and 3200 ÷ 400 = 8.

  1. Use the small fact. 4 × 8 = 32.
  2. Count the zeros. 400 has two zeros.
  3. Put them back. 32 with two zeros is 3200.
  4. Write the two divisions by taking each factor away in turn.
400 × 8 = 3,200
3,200 ÷ 8 = 400
3,200 ÷ 400 = 8
Check it yourself: 8 × 400 = 3,200 ✓ and 400 × 8 = 3,200 ✓. Both division statements pass the test N = D × Q.
Q3.
15 × 60 = _______ , and the two division statements.
Answer

15 × 60 = 900.  Division statements: 900 ÷ 15 = 60 and 900 ÷ 60 = 15.

  1. Drop the zero for a moment. 15 × 6 = 90.
  2. Put the zero back. 60 has one zero, so 90 becomes 900.
  3. Write the two divisions.
15 × 6 = 90
15 × 60 = 900

900 ÷ 15 = 60
900 ÷ 60 = 15
Why it happens: 60 is 6 tens. Multiplying by 6 tens is the same as multiplying by 6 and then by 10, and multiplying by 10 just adds a zero.
Q4.
200 × 16 = _________ , and the two division statements.
Answer

200 × 16 = 3200.  Division statements: 3200 ÷ 16 = 200 and 3200 ÷ 200 = 16.

  1. Use the small fact. 2 × 16 = 32.
  2. Count the zeros. 200 has two zeros.
  3. Put them back. 32 with two zeros is 3,200.
200 × 16 = 3,200
3,200 ÷ 16 = 200
3,200 ÷ 200 = 16
Notice: 400 × 8 and 200 × 16 both give 3,200. In Question 2 one number was doubled and in this one the other was doubled — halving one factor and doubling the other keeps the product the same.
Was this helpful?