Basic Equations
What is 12 × 13?
156
A box has 12 rows with 15 crayons in each row. How many crayons are there total?
180
Use partial products to find 23 × 12.
(20×10) + (20×2) + (3×10) + (3×2) = 200 + 40 + 30 + 6 = 276
What is 23 × 10?
230
20 × 13 = 260. Without multiplying, what is 40 × 13?
Double 260 → 520
What is 24 × 15?
360
A classroom has 23 desks and each desk has 2 drawers. How many drawers in all?
46
Find 34 × 21 using partial products.
(30×20) + (30×1) + (4×20) + (4×1) = 600 + 30 + 80 + 4 = 714
What is 45 × 30?
1,350
The product of 24 × 25 is close to which benchmark number? 400, 600, or 800?
600 (24 × 25 = 600)
What is 36 × 42?
1,512
A farmer plants 14 rows of corn with 26 plants in each row. How many corn plants are there?
364
Solve 46 × 35 using partial products.
(40×30) + (40×5) + (6×30) + (6×5) = 1200 + 200 + 180 + 30 = 1,610
What is 62 × 50?
3,100
If 32 × 15 = 480, what is 64 × 15?
Double 480 → 960
What is 48 × 27?
1,296
A bus company has 18 buses. Each bus holds 42 people. How many people can ride total?
756
Solve 52 × 47 using partial products.
(50×40) + (50×7) + (2×40) + (2×7) = 2000 + 350 + 80 + 14 = 2,444
What is 78 × 60?
4,680
A rectangle is 24 cm long and 12 cm wide. What is its area?
288 cm²
What is 65 × 34?
2,210
A ticket costs $24. If 36 people buy tickets, how much money is collected?
$864
Solve 67 × 89 using partial products.
(60×80) + (60×9) + (7×80) + (7×9) = 4800 + 540 + 560 + 63 = 5,963
What is 94 × 70?
6,580
Explain how you can use 50 × 12 to find 49 × 12.
Subtract one group of 12 → 600 – 12 = 588