Multiplying 2-Digit Numbers I.

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Presentation transcript:

Multiplying 2-Digit Numbers I

Multiplying with a 2-Digit Factor 30 3 × 1 4 1 2 10 + 3 4 2 4 30

Multiplying with a 2-Digit Factor 30 2 3 2 × 1 4 8 10 10 1 2 2 4 4 + 3 30 2 4 4 8

Multiplying with a 2-Digit Factor 1 4 × 3 = 12 1 × 2 = 2 1 × 3 = 3 4 × 2 = 8 Tip: Always cross out a regrouped number after you add it. 2 3 8 + 1 = 9 × 1 4 9 2 1 + 2 3 9 + 3 = 12 2 + 0 = 2 1 + 2 = 3 3 2 2 Step 4: Add 92 and 230. Step 1: Begin multiplying with the ones place. Step 2: 4 can no longer be multiplied. Time to put it “to rest”. You can use a tombstone, a zero, or leave the space blank Step 3: Now we can begin to multiply with the tens place

Multiplying with a 2-Digit Factor 3 Tip: Always cross out a regrouped number after you add it. 8 4 2 × 4 = 8 8 × 4 = 32 2 × 8 = 16 8 × 8 = 64 × 2 8 64 + 3 = 67 1 6 7 2 1 Don't forget the comma! + 1 6 8 1 + 6 + 6 = 13 7 + 8 = 15 1 + 1 = 2 2 + 0 = 2 2 , 3 5 2 Step 4: Add 672 and 1,680. Step 1: Begin multiplying with the ones place. Step 2: 8 can no longer be multiplied. Time to put it “to rest”. You can use a tombstone, a zero, or leave the space blank Step 3: Now we can begin to multiply with the tens place

Multiplying with a 2-Digit Factor 1 3 Tip: Always cross out a regrouped number after you add it. 5 4 4 × 4 = 16 4 × 5 = 20 9 × 5 = 45 9 × 4 = 36 × 4 9 45 + 3 = 48 20 + 1 = 21 1 4 8 6 6 + 0 = 6 Don't forget the comma! + 2 1 6 8 + 6 = 14 2 , 6 4 6 1 + 4 + 1 = 6 Step 1: Begin multiplying with the ones place. Step 2: 4 can no longer be multiplied. Time to put it “to rest”. You can use a tombstone, a zero, or leave the space blank Step 3: Now we can begin to multiply with the tens place Step 4: Add 486 and 2,160.

Multiplying with a 2-Digit Factor 3 × 9 = 27 3 × 5 = 15 Tip: Always cross out a regrouped number after you add it. 5 9 15 + 2 = 17 1 × 5 = 5 1 × 9 = 9 × 3 1 5 9 9 + 0 = 0 1 Don't forget the comma! + 1 7 7 5 + 7 = 12 1 , 8 2 9 1 + 7 = 8 Step 1: Begin multiplying with the ones place. Step 2: 4 can no longer be multiplied. Time to put it “to rest”. You can use a tombstone, a zero, or leave the space blank Step 3: Now we can begin to multiply with the tens place Step 4: Add 59 and 1,770.

Your Turn! Use graph paper to line up your problem. 1 1 6 2 × 8 9 1 5 5 8 1 + 4 9 6 5 , 5 1 8

Your Turn! Use graph paper to line up your problem. 1 7 2 × 5 3 2 1 6 + 3 6 3 , 8 1 6

Your Turn! Use graph paper to line up your problem. 1 5 3 6 × 2 9 3 2 4 + 7 2 1 , 4 4

Your Turn! Use graph paper to line up your problem. 4 5 9 6 × 7 9 8 6 4 1 + 6 7 2 7 , 5 8 4