Reading, Writing and Comparing Whole Numbers Beyond 1,000,000
Primary 6 · Mathematics
Reading, Writing and Comparing Whole Numbers Beyond 1,000,000
Lesson 5 of 6
35 min
Let's begin
A tea factory in Nyamasheke pays 1 245 306 Frw for electricity every month. The manager, Mutesi, wants to know what that costs over two years. Two years is 24 months. That is a big multiplication!
Multiplying by 10 moves every digit one place to the left, so we write one zero at the end. By 100, two zeros. By 1 000, three zeros.
Example: 45 600 × 1 000 = 45 600 000.
Split the 2-digit number into tens and ones, multiply by each part, then add the parts.
Worked example
1 245 306 × 24
Electricity for two years costs 29 887 344 Frw. Estimate to check: about 1 200 000 × 25 = 30 000 000. Our answer is close.
Worked example
A school buys 215 mattresses at 46 850 Frw each. What is the total cost?
Divide from the left. At each step: divide, multiply, subtract, bring down the next digit.
Worked example
7 452 000 Frw is shared equally among 36 community health workers. How much does each one get?
Worked example
A club shares 2 500 000 Frw equally among 12 players. 2 500 000 ÷ 12 = 208 333 remainder 4. Each player gets 208 333 Frw, and 4 Frw is left over. Check: 208 333 × 12 + 4 = 2 500 000. ✔
Tip
Split, multiply, add. Break the smaller number into hundreds, tens and ones, and multiply by each part. For division, remember the four steps: divide, multiply, subtract, bring down.
Work each one in your exercise book first, then tap Show answer to check.
2 306 450 × 30
Answer: 69 193 500. Multiply by 3, then by 10.
A cooperative sells 128 bags of rice at 35 500 Frw each. How much money does it get?
Answer: 4 544 000 Frw.
9 876 000 ÷ 24
Answer: 411 500. Check: 411 500 × 24 = 9 876 000.
3 000 000 Frw is shared equally among 7 families. How much does each family get, and how much is left over?
Answer: 428 571 Frw each, with 3 Frw left over.
What you learned today
Sources and credits
The stories, Rwandan worked examples and practice questions were written by Ganzaa.
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