Addition
47 + 26 =
47 + 26 = 73
85 − 47 =
85 − 47 = 38
7 × 2 =
7 × 2 = 14
8 ÷ 2 =
8 ÷ 2 = 4
I got 8 × 5 by adding 8 + 5 and got 13. Is that right? Why?
Not right. Multiplication is repeated addition of equal groups, and addition is simply adding numbers together.
123 + 245 =
123 + 245 = 368
462 − 238 =
462 − 238 = 224
10 × 5 =
10 × 5 = 50
90 ÷ 10 =
90 ÷ 10 = 9
Draw a picture that shows 3 × 5.
3 groups of 5 or 5 groups of 3
316 + 482 =
316 + 482 = 798
753 − 489 =
753 − 489 = 264
4 × 6 =
4 × 6 = 24
18 ÷ 3 =
18 ÷ 3 = 6
Show 4 × 6 as an addition equation.
4 + 4 + 4 + 4 + 4 + 4 = or 6 + 6 + 6 + 6 =
574 + 328 =
574 + 328 = 902
926 − 517 =
926 − 517 = 409
8 × 9 =
8 × 9 = 72
36 ÷ 4 =
36 ÷ 4 = 9
Why is 7 × 4 the same as 4 × 7?
The order doesn’t change how many there are, just how it looks. Both show 28 total.
1,234 + 2,567 =
1,234 + 2,567 = 3,801
6,432 − 2,758 =
6,432 − 2,758 = 3,674
12 × 5 =
12 × 5 = 60
72 ÷ 9 =
72 ÷ 9 = 8
Show why 12 × 4 = (10 × 4) + (2 × 4).
10 × 4 = 40, 2 × 4 = 8, so 40 + 8 = 48. 12 × 4 = 48. Both equations equal 48.